Annual report pursuant to Section 13 and 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
Dec. 31, 2016
Dec. 31, 2015
Feb. 28, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt $ 497,279    
Convertible senior notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt 69,024 $ 68,335  
Debt instrument, convertible, carrying amount of equity component 13,000   $ 13,000
Convertible senior notes | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 67,444 78,557  
Other Debt Obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt 3,299 2,819  
Other Debt Obligations | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 3,299 2,819  
First Lien Credit Agreement | Term loans with banks      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt 256,004 0  
First Lien Credit Agreement | Term loans with banks | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 260,020 0  
Second Lien Credit Agreement | Term loans with banks      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt 88,082 0  
Second Lien Credit Agreement | Term loans with banks | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 88,780 0  
Revolving Credit Facility | First Lien Credit Agreement      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt 53,891 0  
Revolving Credit Facility | First Lien Credit Agreement | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value $ 52,932 $ 0