Leases - Lease cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Lease Cost [Abstract]
Amortization of ROU assets	$ 475	$ 525	$ 1,531	$ 1,512
Interest on lease liabilities	257	299	795	900
Operating lease cost	7,800	8,361	22,005	24,189
Short-term lease cost	174	38	349	172
Variable lease cost	20	12	70	37
Sublease Income	(19)	(23)	(57)	(83)
Net gain recognized from sale and lease back transaction	(7,007)	0	(7,007)	(5,550)
Total lease cost	$ 1,700	$ 9,212	$ 17,686	$ 21,177