Convertible Senior Notes - Narrative (Details) $ / shares in Units, shares in Millions	1 Months Ended			3 Months Ended		6 Months Ended	9 Months Ended	12 Months Ended
	May 31, 2021 USD ($)	Nov. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($) day	Mar. 31, 2021 day	Jun. 30, 2018 day	Jun. 30, 2021 day	Sep. 30, 2021 day	Dec. 31, 2021 USD ($) day note $ / shares	Dec. 31, 2020 USD ($) day $ / shares	Dec. 31, 2019 USD ($)	Nov. 15, 2020 USD ($)	Jun. 01, 2019 USD ($)	Feb. 28, 2018 USD ($)	Feb. 15, 2018 USD ($)
Debt Instrument [Line Items]
Loss on extinguishment of debt								$ 1,513,000	$ 8,932,000	$ 0
Repayments of convertible debt								$ 63,692,000	$ 0	$ 0
Number of outstanding notes | note								22
Convertible Debt
Debt Instrument [Line Items]
Closing price (in dollars per share) | $ / shares								$ 79.44	$ 126.53
Convertible Senior Notes Due February 2023
Debt Instrument [Line Items]
Unamortized debt issuance costs								$ (300,000)
Remaining discount and issuance costs amortization period								1 year 1 month 6 days
Convertible Senior Notes Due February 2023 | Convertible Debt
Debt Instrument [Line Items]
Principal amount								$ 10,900,000					$ 230,000,000	$ 230,000,000
Principal amount exchanged		$ 181,900,000
Amount issued due to exchange		210,700,000
Long-term debt	$ 10,000,000	42,900,000						10,210,000	$ 42,619,000
Unamortized debt issuance costs		(2,000,000)						(64,000)	$ (501,000)
Loss on extinguishment of debt		8,900,000						$ 1,500,000
Repurchased principal amount	37,100,000
Repayments of convertible debt	$ 63,700,000
Threshold percentage of stock price trigger				130.00%	130.00%	130.00%	130.00%	130.00%	130.00%
Limitation on sale of common stock, sale price threshold, number of trading days | day				20	20	20	20	20	20
Limitation on sale of common stock, sale price threshold, trading period | day				30	30	30	30	30	30
Number of consecutive business days					5 days
Percentage of closing sale price in excess of convertible notes					98.00%
Redemption price percentage								100.00%
Issuance costs attributable to the liability component													5,300,000
Net issuance costs													$ 1,500,000
If-converted value								$ 4,200,000	$ 57,900,000
Convertible Senior Notes Due June 2026
Debt Instrument [Line Items]
Remaining discount and issuance costs amortization period								4 years 4 months 24 days
Convertible Senior Notes Due June 2026 | Convertible Debt
Debt Instrument [Line Items]
Principal amount			$ 316,300,000									$ 316,250,000
Long-term debt								$ 255,056,000	243,159,000
Unamortized debt issuance costs								$ (4,276,000)	(5,114,000)
Threshold percentage of stock price trigger			130.00%
Limitation on sale of common stock, sale price threshold, number of trading days | day			20
Limitation on sale of common stock, sale price threshold, trading period | day			30
Issuance costs attributable to the liability component			$ 6,400,000
Net issuance costs			$ 2,900,000
If-converted value									135,300,000
Convertible Notes Due November 2025
Debt Instrument [Line Items]
Remaining discount and issuance costs amortization period								3 years 10 months 24 days
Convertible Notes Due November 2025 | Convertible Debt
Debt Instrument [Line Items]
Principal amount		350,000,000									$ 350,000,000
Amount issued due to exchange		$ 210,700,000
Shares issued from exchange on convertible senior notes (in shares) | shares		1.3
Long-term debt								$ 286,332,000	271,690,000
Unamortized debt issuance costs								$ (4,232,000)	$ (5,235,000)
Additional principal amount issued		$ 139,300,000
Issuance costs attributable to the liability component		5,400,000
Net issuance costs		$ 1,500,000