Leases Supplemental lease information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Lease, Cost	$ 2,873	$ 3,166
Operating lease right-of-use assets	11,146	13,168
Short-term Lease, Cost	$ 143	$ 159
Operating Lease, Weighted Average Remaining Lease Term	6 years 7 months 13 days	7 years 2 months 26 days
Operating Lease, Weighted Average Discount Rate, Percent	3.60%	3.50%
Operating Lease, Payments, Use	$ 27	$ 18,034