Annual report pursuant to Section 13 and 15(d)

Financing Arrangements (Details)

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Financing Arrangements (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Notes Payable, Current and Noncurrent [Abstract]    
Total current portion of notes payable $ 212,910 $ 201,985
2019 Convertible Senior Notes    
Notes Payable, Current and Noncurrent [Abstract]    
Principal amount outstanding 245,000 245,000
Unamortized discount $ (32,090) $ (43,015)