Debt - Convertible Senior Notes (Details)		12 Months Ended
Jan. 10, 2017 USD ($) D $ / shares	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)
Debt
Proceeds from long-term debt borrowings		$ 335,752,000
Convertible Notes
Debt
Principal amount	$ 345,000,000	345,000,000	$ 345,000,000
Interest rate (as a percent)	2.70%
Proceeds from long-term debt borrowings	$ 335,800,000
Conversion rate	0.249800
Conversion price (in dollars per share) \| $ / shares	$ 40.03
Multiples of principal holders may convert	$ 1,000
Consecutive trading days \| D	30
Stock price trigger (as a percent)	130.00%
Trading days	5
Number of consecutive business days	5 days
Maximum percentage of common stock conversion	98.00%
Measurement input	7.00
Long-term Debt, Measurement Input [Extensible List]	us-gaap:MeasurementInputDiscountRateMember
Debt discount	$ 72,500,000	$ 63,022,000	$ 52,336,000
Transaction costs	9,200,000
Transaction costs allocated to the equity component	$ 1,900,000
Convertible Notes \| Minimum
Debt
Trading days \| D	20

The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount.

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Value of input used to measure long-term debt.

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Indicates measurement input for long-term debt.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Represents the multiples of the principal amount of debt that holders may convert at their option.

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Maximum percentage of common stock converted.

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The amount of Transaction costs allocated to the equity component .

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