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
3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Mar. 27, 2018
Dec. 31, 2017
Feb. 28, 2015
Debt Instrument [Line Items]              
Stated interest rate             2.75%
Debt instrument, face amount $ 754,544   $ 754,544     $ 660,200  
Unamortized bond discounts, fair value adjustments and issue costs, net (67,105)   (67,105)     (41,136)  
Total carrying value of debt 687,439   687,439     619,064  
Less: current portion, net (20,946)   (20,946)     (20,106)  
Total non-current 666,493   666,493     598,958  
Borrowings on revolving credit facility     31,600 $ 78,115      
Long-term debt 754,544   754,544        
Paid-in-Kind interest converted to principal     8,450 $ 0      
Second Lien Credit Agreement              
Debt Instrument [Line Items]              
Debt instrument, face amount 158,450   158,450     0  
Paid-in-Kind interest converted to principal 8,500            
Term loan facility              
Debt Instrument [Line Items]              
Debt instrument, face amount 481,250   481,250     490,625  
Revolving Credit Facility              
Debt Instrument [Line Items]              
Debt instrument, face amount $ 29,015   $ 29,015     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     82,500  
Total carrying value of debt 82,500   82,500        
Long-term debt 70,200   70,200     69,700  
Equity component of convertible debt 13,000   13,000       $ 13,000
Subordinated Debt              
Debt Instrument [Line Items]              
Stated interest rate         10.00%    
Debt instrument, face amount 158,450   158,450     0  
Other debt              
Debt Instrument [Line Items]              
Debt instrument, face amount 3,329   3,329     $ 9,075  
Penny Warrants | Second Lien Credit Agreement              
Debt Instrument [Line Items]              
Equity component of convertible debt 14,900   14,900        
Market Warrants | Second Lien Credit Agreement              
Debt Instrument [Line Items]              
Equity component of convertible debt 9,300   $ 9,300        
Revolving Credit Facility              
Debt Instrument [Line Items]              
Repayments of debt   $ 78,000          
Borrowings on revolving credit facility $ 29,000            
Revolving Credit Facility | Line of Credit              
Debt Instrument [Line Items]              
Repayments of debt   $ 78,000