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Debt Debt - Summary of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Debt Instrument [Line Items]
Amortization of debt discount	$ 2,860	$ 497
Senior Notes | Convertible Note Due 2023
Debt Instrument [Line Items]
Contractual interest expense	1,581	0
Amortization of debt discount	2,108	0
Total	$ 3,689	$ 0
Effective interest rate (as a percent)	5.45%

X

- Definition

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

+ References

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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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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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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