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Long-Term Debt, Convertible Note (Details) |  | 12 Months Ended
--- | --- | ---
Jun. 16, 2016 USD ($) | Dec. 31, 2017 USD ($) d $ / shares shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Convertible Debt [Abstract] |  |  |  |  |
Equity component of convertible notes allocated to additional paid-in capital |  |  |  | $ 6,825,000 |
Net Carrying Amount of Liability Component [Abstract] |  |  |  |  |
Principal | [1] |  | $ 401,768,000 |  |
Unamortized debt discount (conversion option) |  |  | (9,100,000) |  |
Unamortized debt discount (issuance costs) |  |  | (4,000,000) |  |
Debt issuance costs |  |  | 0 | 6,596,000 | $ 0
Interest expense |  |  | 22,200,000 | 15,600,000 | $ 7,900,000
Convertible Note [Member] |  |  |  |  |
Convertible Debt [Abstract] |  |  |  |  |
Original principal amount |  | $ 210,000,000 | $ 210,000,000 |  |
Interest rate |  |  | 4.75% |  |
Maturity date |  |  | Jun. 15, 2020 |  |
Redemption price, percentage of principal amount redeemed |  |  | 100.00% |  |
Threshold percentage of stock price trigger |  |  | 180.00% |  |
Threshold trading days | d |  |  | 20 |  |
Threshold final trading days | d |  |  | 3 |  |
Threshold consecutive trading days | d |  |  | 30 |  |
Principal amount increments that can be repurchased upon a change in control or termination of trading of common stock |  |  | $ 1,000 |  |
Principal amount increments that can be converted |  |  | $ 1,000 |  |
Holding period following issue date before notes can be converted |  |  | 6 months |  |
Initial conversion rate (in shares) | shares |  |  | 21.5054 |  |
Initial conversion price (in dollars per share) | $ / shares |  |  | $ 46.50 |  |
Proceeds from issuance of notes |  | 210,000,000 |  |  |
Liability component of convertible notes |  | 199,100,000 |  |  |
Equity component of convertible notes allocated to additional paid-in capital |  | $ 10,900,000 |  |  |
Effective interest rate |  |  | 7.10% |  |
Net Carrying Amount of Liability Component [Abstract] |  |  |  |  |
Principal |  |  | $ 210,000,000 | $ 210,000,000 |
Unamortized debt discount (conversion option) |  |  | (7,078,000) |  |
Total long-term debt, net |  |  | 202,922,000 |  |
Unamortized debt discount (issuance costs) |  |  | (4,050,000) |  |
Net carrying amount |  |  | 198,872,000 |  |
Debt issuance costs |  |  | 6,596,000 |  |
Additions to deferred financing cost |  |  | 6,300,000 |  |
Adjustments to additional paid-in capital for debt issuance costs |  |  | 300,000 |  |
Interest expense |  |  | 14,000,000 |  |
Contractual interest |  |  | 10,000,000 |  |
Amortization of debt issuance costs and debt discount |  |  | $ 4,000,000 |  |
[1] | The carrying value of the debt reflects the amounts stated in the above table less a debt discount of $13.1 million, which is not reflected in this table.

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