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
Sep. 30, 2017
Dec. 31, 2016
Feb. 28, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying Amount $ 656,919    
Notes payable 615,077 $ 470,300  
Term loan facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying Amount 464,864 0  
Fair Value 483,875 0  
Revolving Credit Facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying Amount 78,000 0  
Fair Value 78,000 0  
Convertible senior notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying Amount 69,544 69,024  
Fair Value $ 53,724 67,444  
Stated interest rate 2.75%   2.75%
Equity component of convertible debt $ 13,000    
Notes payable 82,500    
Other debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying Amount 2,669 3,299  
Fair Value 2,669 3,299  
First Lien Credit Agreement | Term loan facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying Amount 0 256,004  
Fair Value 0 260,020  
First Lien Credit Agreement | Revolving Credit Facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying Amount 0 53,891  
Fair Value 0 52,932  
Second Lien Credit Agreement | Term loan facility      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Carrying Amount 0 88,082  
Fair Value $ 0 $ 88,780