Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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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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Gross amount of debt extinguished.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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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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The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

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Liabilities - 2023 Convertible Senior Notes (Details) - USD ($) $ in Thousands			3 Months Ended	6 Months Ended
	May 18, 2020	Jan. 10, 2017	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Debt
Principal amount			$ 381,695	$ 381,695	$ 345,000
Repurchase of notes				81,240
Loss on extinguishment of debt			(3,046)	(3,046)
2023 Notes
Debt
Principal amount		$ 345,000	$ 256,695	$ 256,695	$ 345,000
Interest rate (as a percent)		2.70%	2.70%	2.70%
Proceeds received, net of transaction fees		$ 335,800
Repurchased and retired amount	$ 88,300
Repurchase of notes	81,200
Debt instrument carrying amount	78,100
Loss on extinguishment of debt	3,000
2027 Notes
Debt
Principal amount	$ 125,000		$ 125,000	$ 125,000
Interest rate (as a percent)	3.75%
Proceeds received, net of transaction fees	$ 121,900