Commitments and Contingencies, Rent (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Rent [Abstract]
Total rent expense	$ 11,669	[1]	$ 11,382	[1]	$ 12,605
Expenses related to non lease components	2,500		2,400
Real Estate [Member]
Rent [Abstract]
Total rent expense	8,290	[1]	7,909	[1]	9,272
Other [Member]
Rent [Abstract]
Total rent expense	$ 3,379	[1]	$ 3,473	[1]	$ 3,333

[1] Includes expenses of approximately $2.5 million and $2.4 million for the years ended December 31, 2020 and 2019, respectively, related to non-lease components such as maintenance, property taxes, etc., and operating lease expense for leases with an initial term of 12 months or less, which is not material.