Quarterly report pursuant to Section 13 or 15(d)

Financing Arrangements - Summary of Outstanding Indebtedness (Details)

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Financing Arrangements - Summary of Outstanding Indebtedness (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Feb. 28, 2015
Debt Instrument [Line Items]      
Unamortized bond discounts, fair value adjustments and issue costs, net $ (38,755) $ (26,979)  
Total carrying value of debt 597,202 470,300  
Less: current portion, net (6,256) (2,069)  
Total non-current 590,946 468,231  
Term loan facility      
Debt Instrument [Line Items]      
Debt instrument, face amount 500,000 0  
Term loan facility | First Lien Credit Agreement      
Debt Instrument [Line Items]      
Debt instrument, face amount 0 263,980  
Term loan facility | Second Lien Credit Agreement      
Debt Instrument [Line Items]      
Debt instrument, face amount 0 92,000  
Revolving Credit Facility      
Debt Instrument [Line Items]      
Debt instrument, face amount 50,000 0  
Revolving Credit Facility | First Lien Credit Agreement      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 0 55,500  
Convertible senior notes      
Debt Instrument [Line Items]      
Stated interest rate 2.75%   2.75%
Debt instrument, face amount $ 82,500 82,500  
Total carrying value of debt 82,500    
Other debt      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 3,457 $ 3,299