Leases - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating Lease Cost	$ 1,439	$ 2,082
Amortization of Lease Assets	39	44
Interest on Lease Liabilities	7	11
Finance Lease Cost	46	55
Sublease Income	(38)	(112)
Total Net Lease Cost	$ 1,447	$ 2,025