Quarterly report pursuant to Section 13 or 15(d)

Financing Arrangements - Summary of Outstanding Indebtedness (Details)

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Financing Arrangements - Summary of Outstanding Indebtedness (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 27, 2018
Dec. 31, 2017
Feb. 28, 2015
Debt Instrument [Line Items]        
Stated interest rate       2.75%
Debt instrument, face amount $ 653,122   $ 619,064  
Long-term Debt 722,058      
Unamortized bond discounts, fair value adjustments and issue costs, net (68,936)   (41,136)  
Total carrying value of debt 653,122   619,064  
Less: current portion, net (19,595)   (20,106)  
Total non-current 633,527   598,958  
Second Lien Credit Agreement        
Debt Instrument [Line Items]        
Debt instrument, face amount 150,000   0  
Line of Credit        
Debt Instrument [Line Items]        
Letters of credit outstanding 7,400      
Term loan facility        
Debt Instrument [Line Items]        
Debt instrument, face amount 484,375   490,625  
Revolving Credit Facility        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 0   78,000  
Convertible senior notes        
Debt Instrument [Line Items]        
Stated interest rate 2.75% 2.75%   2.75%
Debt instrument, face amount $ 82,500   82,500  
Long-term Debt 70,100   69,700  
Total carrying value of debt 82,500      
Equity component of convertible debt 13,000     $ 13,000
Subordinated Debt        
Debt Instrument [Line Items]        
Stated interest rate   10.00%    
Debt instrument, face amount 150,000   0  
Other debt        
Debt Instrument [Line Items]        
Debt instrument, face amount 5,183   9,075  
Penny Warrants | Second Lien Credit Agreement        
Debt Instrument [Line Items]        
Equity component of convertible debt 14,900      
Market Warrants | Second Lien Credit Agreement        
Debt Instrument [Line Items]        
Equity component of convertible debt 9,300      
Revolving Credit Facility | Line of Credit        
Debt Instrument [Line Items]        
Debt instrument, face amount     $ 78,000  
Letters of Credit | Line of Credit        
Debt Instrument [Line Items]        
Letters of credit outstanding $ 6,200