Prepaid Expenses and Other Current Assets and Other Assets (Schedule of Other Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Prepaid Expenses and Other Current Assets and Other Assets [Abstract]
Straight-line rent receivable	$ 318,107	$ 321,816
Interest rate swap asset	43,689	12,123
Loan receivables	5,304	5,931
Deferred lease costs, net	5,029	4,788
Deferred tax asset - long term	71,494	53,722
Long-term investments	55,523	57,575
Other	21,748	22,037
Total other assets	$ 520,894	$ 477,992