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Convertible Senior Notes (Details) - 3.00% Convertible senior notes due 2022 - Convertible debt - USD ($) | Sep. 30, 2016 | Dec. 31, 2015 | Aug. 31, 2015
--- | --- | --- | ---
Long-term debt |  |  |
Principal | $ 150,000,000 | $ 150,000,000 | $ 150,000,000.0
Less: Debt issuance costs | (2,536,000) | (2,760,000) |
Less: Debt discount, net | (50,905,000) | (55,392,000) |
Net carrying amount | $ 96,559,000 | $ 91,848,000 |

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