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Accounts Payable, Accrued Expenses and Other Liabilities Accounts Payable, Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
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Payables and Accruals [Abstract] |  |  |
Accrued dividends payable | $ 63,598 | $ 56,576 | $ 51,109
Accrued interest payable | 5,336 | 12,796 |
Accounts payable and other liabilities | 4,396 | 1,534 |
Total | $ 73,330 | $ 70,906 |

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