Quarterly report pursuant to Section 13 or 15(d)

Debt Instruments - Schedule of Long-Term Debt (Details)

v3.7.0.1
Debt Instruments - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Dec. 09, 2015
Debt Instrument [Line Items]      
Unamortized discount and deferred issuance costs $ (87,777) $ (92,753)  
Long-term debt, net 347,223 342,247  
Line of credit      
Debt Instrument [Line Items]      
Credit facility $ 90,000 90,000  
Interest rate 3.81%    
Convertible debt | 1.75% convertible senior notes due 2020      
Debt Instrument [Line Items]      
1.75% convertible senior notes due 2020 $ 345,000 $ 345,000  
Interest rate 1.75%   1.75%