Leases - Lease cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Lease Cost [Abstract]
Amortization of ROU assets	$ 475	$ 467	$ 1,056	$ 987
Interest on lease liabilities	265	288	538	601
Operating lease cost	7,150	7,914	14,205	15,828
Short-term lease cost	88	77	175	134
Variable lease cost	20	14	50	25
Sublease Income	(19)	(30)	(38)	(60)
Net gain recognized from sale and lease back transaction	0	(5,550)	0	(5,550)
Total lease cost	$ 7,979	$ 3,180	$ 15,986	$ 11,965