Quarterly report pursuant to Section 13 or 15(d)

Notes Payable, Revolver, Bank Term Loans and Other Debt - Narrative (Details)

v3.5.0.2
Notes Payable, Revolver, Bank Term Loans and Other Debt - Narrative (Details)
1 Months Ended 9 Months Ended 12 Months Ended
Jul. 01, 2015
USD ($)
Dec. 22, 2014
USD ($)
Feb. 28, 2015
USD ($)
d
$ / shares
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jul. 27, 2016
USD ($)
Jun. 29, 2016
USD ($)
Oct. 18, 2013
USD ($)
Citibank | Term Loan                
Debt Instrument [Line Items]                
Debt issuance costs   $ 300,000            
Maximum borrowing capacity   2,400,000.0            
Loan payment   200,000            
Term loan         $ 1,300,000      
Citibank | Revolving credit facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 20,000,000.0   $ 20,000,000.0        
IFES Acquisition Corp Limited                
Debt Instrument [Line Items]                
Business acquisition, assumed indebtedness               $ 1,300,000
Effective interest rate percentage       1.75%        
First Lien Credit Agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 319,000,000.0              
First Lien Credit Agreement | Revolving credit facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 35,000,000.0           $ 75,500,000.0  
Term loan           $ 29,000,000    
Line of Credit                
Debt Instrument [Line Items]                
Borrowings outstanding under facility letters       $ 700,000 900,000      
Convertible Debt                
Debt Instrument [Line Items]                
Debt instrument, face amount     $ 82,500,000.0          
Stated interest rate     2.75%          
Conversion ratio     0.0539084          
Conversion price (in usd per share) | $ / shares     $ 18.55          
Convertible debt     $ 69,500,000 68,900,000 68,300,000      
Equity component of convertible debt     13,000,000 13,000,000        
Convertible Debt | Liability component                
Debt Instrument [Line Items]                
Debt issuance costs     1,800,000          
Convertible Debt | Additional paid-in capital                
Debt Instrument [Line Items]                
Debt issuance costs     $ 300,000          
Convertible Debt | If company undergoes a fundamental change                
Debt Instrument [Line Items]                
Redemption price percentage     100.00%          
Convertible Debt | On or after February 20, 2019                
Debt Instrument [Line Items]                
Percent of stock price to trigger conversion     130.00%          
Trading days | d     20          
Consecutive trading days     30 days          
Convertible Debt | On or after February 20, 2022                
Debt Instrument [Line Items]                
Redemption price percentage     100.00%          
Convertible Debt | Redemption scenario one | After March 31, 2015                
Debt Instrument [Line Items]                
Percent of stock price to trigger conversion     130.00%          
Convertible Debt | Redemption scenario two | After March 31, 2015                
Debt Instrument [Line Items]                
Percent of stock price to trigger conversion     98.00%          
Consecutive business days | d     5          
Consecutive trading days     5 days          
Term Loan | First Lien Credit Agreement                
Debt Instrument [Line Items]                
Term loan           $ 265,300,000    
Principal amortization payment percentage 0.25%              
Covenant net leverage ratio, minimum 3.50              
Covenant net leverage ratio, maximum 3.00              
Term Loan | First Lien Credit Agreement | After March 31, 2015                
Debt Instrument [Line Items]                
Covenant net leverage ratio, maximum 3.75              
Term Loan | First Lien Credit Agreement | On or after February 20, 2019                
Debt Instrument [Line Items]                
Covenant net leverage ratio, maximum 3.50              
Term Loan | First Lien Credit Agreement | On or after February 20, 2022                
Debt Instrument [Line Items]                
Covenant net leverage ratio, maximum 3.25              
Term Loan | First Lien Credit Agreement | Debt Instrument, Redemption, Period Five                
Debt Instrument [Line Items]                
Covenant net leverage ratio, maximum 3.00              
Term Loan | Second Lien Credit Agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 92,000,000.0              
Term loan $ 92,000,000              
Term Loan | Second Lien Credit Agreement | After March 31, 2015                
Debt Instrument [Line Items]                
Covenant net leverage ratio, maximum 5.75              
Term Loan | Second Lien Credit Agreement | If company undergoes a fundamental change                
Debt Instrument [Line Items]                
Covenant net leverage ratio, maximum 5.00              
Term Loan | Second Lien Credit Agreement | On or after February 20, 2019                
Debt Instrument [Line Items]                
Covenant net leverage ratio, maximum 5.50              
Term Loan | Second Lien Credit Agreement | On or after February 20, 2022                
Debt Instrument [Line Items]                
Covenant net leverage ratio, maximum 5.25              
Commercial Mortgage Loan | Mortgage letters maturing October 2014 | IFES Acquisition Corp Limited                
Debt Instrument [Line Items]                
Business acquisition, assumed indebtedness               200,000
Commercial Mortgage Loan | Mortgage letters maturing October 2032 | IFES Acquisition Corp Limited                
Debt Instrument [Line Items]                
Business acquisition, assumed indebtedness               $ 1,100,000
Accrued interest on mortgage letters       $ 0 $ 0      
Adjusted Base Rate | Term Loan | First Lien Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate 4.75%              
Adjusted Base Rate | Term Loan | Second Lien Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate 8.625%              
Adjusted Base Eurocurrency Rate | Term Loan | First Lien Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate 5.75%              
Adjusted Base Eurocurrency Rate | Term Loan | Second Lien Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate 9.625%