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

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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