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
Mar. 31, 2018
Mar. 27, 2018
Dec. 31, 2017
Feb. 28, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Carrying Amount $ (736,083)   $ (619,064)  
Fair Value (764,507)   (617,333)  
Stated interest rate       2.75%
Amount outstanding 736,083   619,064  
Term loan facility        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Carrying Amount (487,500)   (490,625)  
Fair Value (504,563)   (486,945)  
Revolving Credit Facility        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Carrying Amount (78,000)   (78,000)  
Fair Value (78,000)   (78,000)  
Convertible senior notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Carrying Amount (82,500)   (82,500)  
Fair Value $ (52,594)   (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 (8,823)   (9,075)  
Fair Value (8,823)   (9,075)  
Second Lien Credit Agreement        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Carrying Amount (124,626)   0  
Fair Value (120,527)   0  
Unamortized bond discounts and issue costs        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Carrying Amount (45,366)   (41,136)  
Fair Value $ 0   $ 0