Lease Commitments - Supplemental Cash Flow (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 outflows from operating leases	$ 32,482	$ 33,774
Financing cash outflows from finance leases	803	605
Leased assets obtained in exchange for new finance lease liabilities	67	43
Leased assets obtained in exchange for new finance lease liabilities	$ 200	$ 342