Leases (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) numberOfLeasesNotYetCommenced		Dec. 31, 2019 USD ($) numberOfLeasesNotYetCommenced	Dec. 31, 2018 USD ($)
Operating lease right-of-use assets	$ 29,521		$ 26,792
Operating lease liabilities	31,717	[1]	28,861
Rent expense	$ 3,977		$ 3,773	$ 3,700
Number of operating leases not yet commenced | numberOfLeasesNotYetCommenced	0		1

[1] Includes short-term operating lease liabilities of $2.9 million.