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, 2016
Dec. 31, 2015
Feb. 28, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt $ 469,305    
Convertible senior notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt 68,851 $ 68,335  
Equity component of convertible debt 13,000   $ 13,000
Term loans with banks      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt 371,857 886  
Other debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt 816 1,343  
Fair value | Convertible senior notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 68,941 78,557  
Fair value | Term loans with banks      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 370,588 886  
Fair value | Other debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value $ 816 $ 1,343