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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
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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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