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Financing Arrangements (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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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)

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