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Convertible Senior Notes - Interest Expense Recognized (Details) - Convertible Senior Notes - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
0% Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Amortization of debt discount	$ 0	$ 14,568	$ 0
Amortization of issuance costs	2,635	728	0
Total interest expense	2,635	15,296	0
0.125 Percent Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Contractual interest expense	896	1,001	769
Amortization of debt discount	0	35,561	27,302
Amortization of issuance costs	3,045	2,443	1,876
Total interest expense	3,941	39,005	29,947
0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Contractual interest expense	78	691	862
Amortization of debt discount	0	10,073	12,536
Amortization of issuance costs	242	1,200	1,488
Total interest expense	$ 320	$ 11,964	$ 14,886

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