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Debt - Components of Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
1.75% convertible senior notes due 2025	$ 450,000
Debt issuance costs, unamortized	(8,440)
Discount on debt	(125,002)
Long-term debt, net	316,558		$ 55,567
Convertible Notes Payable
Debt Instrument [Line Items]
Discount on debt	$ (125,000)
Convertible Notes Payable | 1.75% Convertible Senior Note Due 2025
Debt Instrument [Line Items]
Debt issuance costs, unamortized		$ (14,200)
Proceeds from issuance of 1.75% convertible senior notes due 2025	1.75%

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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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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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