Quarterly report pursuant to Section 13 or 15(d)

Convertible Senior Notes (Notes Payable) (Details)

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Convertible Senior Notes (Notes Payable) (Details) - 2019 convertible senior notes - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Notes Payable, Current and Noncurrent [Abstract]    
Principal amount outstanding $ 245,000 $ 245,000
Unamortized discount (29,252) (32,090)
Total current portion of notes payable $ 215,748 $ 212,910