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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No definition available.

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- Definition

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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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

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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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Price of a single share of a number of saleable stocks of a company.

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The tax component of the 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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Percentage of premium of the effective conversion price of convertible debt instrument to the entity's share closing price.

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The minimum percentage of premium on closing share price for derivative cap price.

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The amount of cash outflow for payment of derivative capped transactions.

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Convertible Notes (Details) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2018 USD ($) D $ / shares $ / EquityInstruments	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 02, 2018 $ / shares
Convertible Notes
Gross proceeds from Convertible Notes		$ 195,716	$ 0	$ 0
Tax effect on the equity component of the Convertible Notes recorded as additional paid-in capital		$ 5,686
Convertible Notes
Convertible Notes
Gross proceeds from Convertible Notes	$ 201,250
Percentage of interest rate per annum	1.00%
Conversion ratio	0.0236323	0.0236323
Conversion price per share \| $ / shares	$ 42.31
Effective conversion price, percentage of premium to share closing price	30.00%
Share price \| $ / shares					$ 32.55
Percentage of redemption price	100.00%
Threshold percentage of stock price trigger	130.00%
Threshold trading days \| D	20
Threshold consecutive trading days \| D	30
Convertible Notes \| Call option
Convertible Notes
Derivative cap price (in dollars per share) \| $ / EquityInstruments	65.10
Derivative cap price, minimum percentage of premium on share price	100.00%
Payment of derivative capped transactions	$ 23,969
Tax effect on the equity component of the Convertible Notes recorded as additional paid-in capital	$ 5,686