Leases (Supplemental Cash Flow Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows relating to operating leases	$ 12,127	$ 11,652
Lease liabilities arising from obtaining right-of-use assets:
Operating leases	$ 9,463	$ 918