Summary of Significant Accounting Policies (Schedule of Right-of-use Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Summary of Significant Accounting Policies [Abstract]
Current operating lease liabilities	$ 236,804	$ 234,605
Current financing lease liabilities	1,693	1,432
Current lease liabilities	238,497	236,037
Long-term operating lease liabilities	1,979,239	2,092,353
Long-term financing lease liabilities	2,114	2,010
Long-term lease liabilities	$ 1,981,353	$ 2,094,363