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Convertible Senior Notes - Interest Expense Recognized (Details) - Senior Notes - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
0.125 Percent Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Contractual interest expense	$ 769
Amortization of debt discount	27,302
Amortization of issuance costs	1,876
Total interest expense	29,947
0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Contractual interest expense	862	$ 645
Amortization of debt discount	12,536	9,377
Amortization of issuance costs	1,488	1,117
Total interest expense	$ 14,886	$ 11,139

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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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