Prepaid Expenses and Other Current Assets and Other Assets (Schedule of Prepaid Expense and Other Current Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Prepaid Expenses and Other Current Assets and Other Assets [Abstract]
Prepaid ground rent	$ 2,508	$ 1,632
Prepaid real estate taxes	4,349	3,003
Prepaid taxes	5,087	4,924
Other	18,050	27,722
Total prepaid expenses and other current assets	$ 29,994	$ 37,281