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Prepaid Expenses and Other Current Assets and Other Assets (Schedule Of Other Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Prepaid Expenses and Other Current Assets and Other Assets [Abstract]    
Prepaid ground rent $ 263,694 $ 220,493
Straight-line rent receivable 322,073 313,650
Loan receivables 49,255 52,383
Deferred lease costs, net 27,020 27,703
Deferred tax asset - long term 18,330 1,670
Other 41,661 34,296
Total other assets $ 722,033 $ 650,195