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Long-term debt, 2015 Convertible Notes (Details 2) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2015 USD ($) item $ / shares | Dec. 31, 2015 USD ($)
Long-term debt |  |
Amortization of debt issuance costs |  | $ 107,000
3.00% Convertible senior notes due 2022 | Convertible debt |  |
Long-term debt |  |
Principal amount of Notes | $ 150,000,000 | 150,000,000
Less: Debt discount, net |  | (55,392,000)
Net carrying amount |  | 94,608,000
Interest rate | 3.00% |
Net proceeds from issuance of convertible notes | $ 145,400,000 |
Trading days, number | item | 20 |
Consecutive trading days, period | 30 days |
Stock price trigger (as a percent) | 130.00% |
Business days, period | 5 days |
Consecutive trading-day period | 5 days |
Common stock per principal amount | $ 1,000 |
Maximum product of the closing sale price of shares of the Company's common stock and the applicable conversion rate for such trading day (as a percent) | 98.00% |
Conversion ratio | 17.7487 |
Conversion price per share | $ / shares | $ 56.34 |
Minimum percentage of principal held by convertible debt instrument holders required to issue notice for declaration of principal and unpaid interest payable upon events of default (as a percent) | 25.00% |
Convertible Instruments Principal And Unpaid Interest Payable Upon Events Of Default | 100.00% |
Term of the convertible notes | 7 years |
Net deferred tax liability in connection with convertible notes | $ 22,300,000 |
Contractual interest expense |  | 1,702,000
Amortization of debt issuance costs |  | 107,000
Debt discount recorded to interest expense |  | 2,146,000
Total |  | $ 3,955,000
Effective interest rate of the liability component (as a percent) |  | 11.00%
3.00% Convertible senior notes due 2022 | Convertible debt | Redemption on or after August 20, 2018 |  |
Long-term debt |  |
Trading days, number | item | 19 |
Consecutive trading days, period | 30 days |
Stock price trigger (as a percent) | 130.00% |
Redemption price (as a percent) | 100.00% |

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