Lease Commitments (Summary of Future Required Fixed Payments Related to Leasing Arrangements) (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Leases [Abstract]
2021	$ 22,022
2022	22,165
2023	19,949
2024	18,841
2025	18,218
2026 and thereafter	134,525
Total minimum future amounts	235,720
Impact of measuring the lease liability on a discounted basis	(55,248)
Total lease liability	$ 180,472