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Debt (Details) - 3.00% Convertible senior notes due 2022 - Convertible debt - USD ($) | Jun. 30, 2017 | Dec. 31, 2016 | Aug. 31, 2015
--- | --- | --- | ---
Long-term debt |  |  |
Principal | $ 150,000,000 | $ 150,000,000 | $ 150,000,000.0
Less: Debt issuance costs | (2,294,000) | (2,457,000) |
Less: Debt discount, net | (46,054,000) | (49,327,000) |
Net carrying amount | $ 101,652,000 | $ 98,216,000 |

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