Prepaid Expenses and Other Current Assets and Other Assets (Schedule of Other Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Assets, Noncurrent [Line Items]
Deferred tax asset - long term	$ 372,264	$ 375,935
Long-term investments	57,600	13,300
Total other assets	477,992	432,078
Other Assets [Member]
Other Assets, Noncurrent [Line Items]
Straight-line rent receivable	321,816	330,660
Interest rate swap asset	12,123	47,583
Loan receivables	5,931	8,295
Deferred lease costs, net	4,788	4,865
Deferred tax asset - long term	53,722	4,342
Long-term investments	57,575	13,255
Other	22,037	23,078
Total other assets	$ 477,992	$ 432,078