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Debt - Interest expense recognized (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Apr. 21, 2021	Sep. 30, 2021	Sep. 30, 2021
Senior Notes \| Convertible Senior Notes Due 2026
Debt Instrument
Contractual interest expense		$ (379)	$ (838)
Amortization of debt discount and debt issuance costs		(430)	(953)
Total		(809)	(1,791)
Revolving Credit Facility
Debt Instrument
Amortization of debt discount and debt issuance costs		0	(1,489)
Total		0	(8,209)
Revolving Credit Facility \| Bridge Loan
Debt Instrument
Unsecured bridge loan facility commitment fee	$ (6,400)	0	(6,407)
Revolving Credit Facility \| Senior Unsecured Revolving Credit Facility
Debt Instrument
Contractual interest expense		(84)	(618)
Revolving Credit Facility \| 2021 Credit Agreement
Debt Instrument
Amortization of debt discount and debt issuance costs		(692)	(1,223)
Total		(4,268)	(7,994)
Revolving Credit Facility \| Term Loan
Debt Instrument
Contractual interest expense		(3,492)	(6,153)
Revolving Credit Facility \| 2019 Credit Agreement
Debt Instrument
Contractual interest expense		$ 0	$ (313)