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Recent Accounting Pronouncements - (Details) - USD ($)	Jan. 01, 2021	Sep. 30, 2021	Mar. 19, 2021	Dec. 31, 2020	Jan. 30, 2018
1.5% Convertible Unsecured Senior Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stated interest rate		1.50%
Effective interest rate percentage					6.00%
Debt instrument, face amount					$ 200,000,000
4.75% Convertible Senior Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stated interest rate		4.75%	4.75%
Debt instrument, face amount			$ 135,000,000
Convertible Debt | 1.5% Convertible Unsecured Senior Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective interest rate percentage	2.00%			6.00%
Convertible Debt | 1.5% Convertible Unsecured Senior Notes | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt instrument, increase net	$ 12,200,000
Decrease in deferred income taxes	2,700,000
Net decrease, stockholder's equity	$ 9,500,000

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