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Financing Arrangements (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Notes Payable, Current and Noncurrent [Abstract] |  |
Current portion of notes payable | $ 201,985 | $ 334
Long-term portion of notes payable |  | 195,908
Convertible notes payable, 2.16% to 3.84%, due 2015, VIE |  |
Notes Payable, Current and Noncurrent [Abstract] |  |
Current portion of notes payable | $ 0 | 334
Convertible notes payable, 2.16% to 3.84%, due 2015, VIE | Minimum |  |
Notes Payable, Current and Noncurrent [Abstract] |  |
Interest on debt instrument (percent) | 2.16% |
Convertible notes payable, 2.16% to 3.84%, due 2015, VIE | Maximum |  |
Notes Payable, Current and Noncurrent [Abstract] |  |
Interest on debt instrument (percent) | 3.84% |
2019 Convertible Senior Notes |  |
Notes Payable, Current and Noncurrent [Abstract] |  |
Principal amount outstanding | $ 245,000 | 245,000
Unamortized discount | $ (43,015) | (49,092)
Long-term portion of notes payable |  | $ 195,908

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