Leases (Narrative) (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2021 USD ($)		Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Number of operating leases not yet commenced		0			0
Operating lease rent expense	[1]	$ 1,020		$ 964
Options to extend reasonably certain of being exercised	[2],[3]	2,100
Short-term operating lease liabilities		2,900
Operating lease right-of-use assets		28,761			$ 29,521
Operating lease liabilities		$ 30,974	[3]		$ 31,717

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

[2] Includes $2.1 million related to options to extend lease terms that are reasonably certain of being exercised.

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