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Long-term Debt - Repurchase of Outstanding Debt (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		33 Months Ended
	Mar. 19, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021
Debt Instrument [Line Items]
Cash Paid				$ 125,952	$ 20,078
Non-cash Gains Recognized				4,022	10,721
1.5% Convertible Unsecured Senior Notes
Debt Instrument [Line Items]
Principal Amount		$ 0	$ 17,200	131,400	34,881	$ 174,000
Carrying Value of Liability		0	15,425	129,974	30,799
Cash Paid	$ 120,000	0	9,483	125,952	20,078	$ 152,800
Non-cash Gains Recognized		$ 0	$ 5,942	$ 4,022	$ 10,721

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Debt Instrument, Amount Repurchased

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Debt Instrument, Principal Amount Repurchased

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- Definition

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 outflow from the repayment 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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