Commitments and Contingencies (Annual Minimum Lease Payments) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finance Leases
2021	$ 1,461
2022	1,243
2023	814
2024	78
Total minimum lease payments	3,596
Less: amount representing interest	(154)
Present value of future payments	3,442
Less: current obligations	(1,432)	$ (1,350)
Long-term obligations	2,010	2,542
Operating Leases
2021	242,581
2022	244,547
2023	245,453
2024	245,204
2025	242,767
Thereafter	2,737,820
Total minimum lease payments	3,958,372
Less: amount representing interest	(1,631,414)
Present value of future payments	2,326,958
Less: current obligations	(234,605)	(245,665)
Long-term obligations	$ 2,092,353	$ 2,276,858