Convertible Senior Notes - Bond Hedges and Warrant Transactions Narrative (Details) $ / shares in Units, $ in Thousands	1 Months Ended			12 Months Ended
	May 31, 2021 USD ($) shares	Nov. 30, 2020 USD ($) shares	Feb. 28, 2018 USD ($) day $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Feb. 15, 2018 $ / shares
Debt Instrument [Line Items]
Number of warrants issued, subject to anti-dilution adjustments (in shares) | shares			4,000,000.0
Payments for hedge				$ (41,700)
Proceeds from Issuance of Warrants			$ 22,400
Convertible debt, number of scheduled trading days | day			80
Warrant strike price (in dollars per share) | $ / shares			$ 78.75	$ 78.75
Payments for warrants				$ 19,655	$ 137,538	$ 0
Convertible Senior Notes Due February 2023 | Convertible Debt
Debt Instrument [Line Items]
Number of warrants issued, subject to anti-dilution adjustments (in shares) | shares			900,000	100,000
Conversion price (in dollars per share) | $ / shares			$ 57.38				$ 57.38
Number of securities called by warrants (in shares) | shares		700,000
Proceeds from Issuance of Warrants		$ 171,700
Bond Hedge | Convertible Senior Notes Due February 2023 | Convertible Debt
Debt Instrument [Line Items]
Number of warrants issued, subject to anti-dilution adjustments (in shares) | shares	100,000
Proceeds from Issuance of Warrants	$ 26,300
Warrant Transaction | Convertible Senior Notes Due February 2023 | Convertible Debt
Debt Instrument [Line Items]
Number of warrants issued, subject to anti-dilution adjustments (in shares) | shares	600,000			200,000
Number of securities called by warrants (in shares) | shares		3,200,000
Proceeds from Issuance of Warrants	$ 19,700
Payments for warrants		$ 137,500