Leases - Other information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Leases.
Cash paid for amounts included in the measurement of lease liabilities - operating leases (in thousands)	$ 10,151	$ 11,922
ROU assets obtained in exchange for operating lease liabilities (in thousands)	5,974	$ 3,202
ROU assets obtained in exchange for finance lease liabilities (in thousands)	$ 21,778
Weighted average remaining lease term - finance lease (months)	8 months
Weighted average remaining lease term - operating leases (years)	5 years 4 months 28 days	5 years 2 months 12 days
Weighted average discount rate - finance lease	1.70%
Weighted average discount rate - operating leases	2.29%	2.82%