Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Fair Value, by Balance Sheet (Details)

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Basis of Presentation and Summary of Significant Accounting Policies - Fair Value, by Balance Sheet (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Mar. 27, 2018
Dec. 31, 2017
Feb. 28, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying Amount $ (653,122)     $ (619,064)  
Fair Value (690,152)     (617,333)  
Proceeds from borrowings 0 $ 50,000      
Stated interest rate         2.75%
Amount outstanding 653,122     619,064  
Term loan facility          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying Amount (484,375)     (490,625)  
Fair Value (491,641)     (486,945)  
Revolving Credit Facility          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying Amount 0     (78,000)  
Fair Value 0     (78,000)  
Convertible senior notes          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying Amount (82,500)     (82,500)  
Fair Value $ (60,380)     (43,313)  
Stated interest rate 2.75%   2.75%   2.75%
Equity component of convertible debt $ 13,000       $ 13,000
Amount outstanding 82,500        
Other debt          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying Amount (5,183)     (9,075)  
Fair Value (5,183)     (9,075)  
Second Lien Credit Agreement          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying Amount (150,000)     0  
Fair Value (132,948)     0  
Second Lien Credit Agreement | Penny Warrants          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Equity component of convertible debt 14,900        
Second Lien Credit Agreement | Market Warrants          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Equity component of convertible debt 9,300        
Unamortized bond discounts and issue costs          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying Amount       (41,136)  
Fair Value $ 0     0  
Revolving Credit Facility | Line of Credit          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Carrying Amount       $ (78,000)