Annual report pursuant to Section 13 and 15(d)

Financing Arrangements - Summary of Debt (Details)

v3.19.1
Financing Arrangements - Summary of Debt (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mar. 27, 2018
Feb. 28, 2015
Debt Instrument [Line Items]            
Debt   $ 774,797,000        
Unamortized bond discounts, fair value adjustments and issue costs, net   (65,186,000) $ (41,136,000)      
Total carrying value of debt   709,611,000 619,064,000      
Less: current portion, net   (22,673,000) (20,106,000)      
Total noncurrent debt   686,938,000 598,958,000      
Conversion of PIK interest on our Second Lien Notes to additional principal   8,450,000 0 $ 0    
Bank term loans            
Debt Instrument [Line Items]            
Debt   478,125,000 490,625,000      
Revolving Credit Facility            
Debt Instrument [Line Items]            
Debt   54,015,000 78,000,000      
Convertible subordinated notes            
Debt Instrument [Line Items]            
Debt   $ 82,500,000 82,500,000      
Stated interest rate   2.75%       2.75%
Convertible debt   $ 70,400,000 69,700,000      
Debt instrument, convertible, carrying amount of equity component   13,000,000        
Second lien notes, due 2023            
Debt Instrument [Line Items]            
Debt   158,450,000 0   $ 150,000,000  
Other debt            
Debt Instrument [Line Items]            
Debt   1,707,000 $ 9,075,000      
Revolving Credit Facility            
Debt Instrument [Line Items]            
Repayments of Debt $ 78,000,000          
Penny Warrants | Second Lien Credit Agreement            
Debt Instrument [Line Items]            
Debt instrument, convertible, carrying amount of equity component   14,900,000        
Market Warrants | Second Lien Credit Agreement            
Debt Instrument [Line Items]            
Debt instrument, convertible, carrying amount of equity component   $ 9,300,000