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Debt - Convertible Senior Notes (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Jan. 10, 2017 USD ($) D $ / shares	Dec. 31, 2017 USD ($)
Long-term debt
Proceeds from long-term debt borrowings		$ 335,752
Fair value of the liability component		46,375
Convertible Senior Notes
Long-term debt
Aggregate principal amount	$ 345,000	$ 345,000
Interest rate (as a percent)	2.70%
Conversion rate	24.9800
Conversion price per share | $ / shares	$ 40.03
Consecutive trading days	30 days
Stock price trigger (as a percent)	130.00%
Number of consecutive business days	5 days
Maximum percentage of common stock conversion	98.00%
Discount rate (as a percent)	7.00%
Fair value of the liability component	$ 72,500
Transaction costs	9,200
Transaction costs allocated to the equity component	$ 1,900
Convertible Senior Notes | Minimum
Long-term debt
Trading days | D	20

X

- Definition

Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital.

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

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of 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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Maximum percentage of common stock converted.

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The amount of Transaction costs allocated to the equity component .

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