Liabilities - 2023, 2025 and 2027 Convertible Senior Notes (Details) - USD ($) $ in Thousands	Nov. 05, 2021	Nov. 11, 2020	May 18, 2020	Jan. 10, 2017	Sep. 30, 2022	Dec. 31, 2021	Nov. 17, 2020
Debt
Principal amount					$ 277,673	$ 277,673
2023 Notes
Debt
Principal amount				$ 345,000	20,173	20,173
Interest rate (as a percent)				2.70%
Proceeds, net of issuance costs				$ 335,800
Repurchased and retired amount	$ 111,500	$ 125,000	$ 88,300
Carrying amount of debt extinguished	105,500	$ 113,100	78,100
Cash paid for repurchase of notes	115,600		81,200
Accrued and unpaid interest	$ 1,000
2025 Notes
Debt
Principal amount					132,500	132,500	$ 132,500
Interest rate (as a percent)							3.50%
2027 Notes
Debt
Principal amount			$ 125,000		$ 125,000	$ 125,000
Interest rate (as a percent)			3.75%
Proceeds, net of issuance costs			$ 121,900
Purchase of capped calls			$ 10,300