Debt - Interest Expense of Convertible Notes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Interest Expense	$ 28,900	$ 26,500	$ 15,300
Convertible Senior Notes Due 2024 | Convertible debt
Debt Instrument [Line Items]
Stated interest	4,744	4,751	1,476
Amortized debt discount	23,170	20,837	5,989
Amortized issuance costs	983	885	254
Interest Expense	$ 28,897	$ 26,473	$ 7,719