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Prepaid Expenses and Other Current Assets and Other Assets (Schedule of Prepaid Expense and Other Current Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Prepaid Expenses and Other Current Assets and Other Assets [Abstract]
Prepaid ground rent	$ 1,865	$ 1,412
Prepaid real estate taxes	3,292	3,153
Prepaid taxes	6,179	8,121
Other current assets	14,304	11,189
Total prepaid expenses and other current assets	$ 25,640	$ 23,875

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