Leases (Narrative) (Details) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2021 USD ($)		Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)		Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Number of operating leases not yet commenced		1			1			0
Operating lease rent expense	[1]	$ 1,021		$ 973	$ 2,041		$ 1,937
Options to extend reasonably certain of being exercised					1,400
Short-term operating lease liabilities		3,000			3,000
Operating lease right-of-use assets		28,329			28,329			$ 29,521
Operating lease liabilities		$ 30,558	[2]		$ 30,558	[2]		$ 31,717

[1] Included in net occupancy expenses in the Unaudited Consolidated Income Statement.

[2] Includes short-term operating lease liabilities of $3.0 million.