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Accounts payable, accrued expenses and other liabilities | 12 Months Ended
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Dec. 31, 2017
Payables and Accruals [Abstract] |
Accounts payable, accrued expenses and other liabilities | Accounts payable, accrued expenses and other liabilities Accounts payable, accrued expenses and other liabilities consisted of the following as of December 31, 2017 and 2016:
| As of December 31,
| 2017 |  | 2016
Accounts payable and accrued expenses | $ | 307,391 |  |  | $ | 330,437 |
Deferred revenue | 452,846 |  |  | 463,090 |
Accrued interest | 254,865 |  |  | 287,205 |
Guarantees (Note 29) | 2,272 |  |  | 51,804 |
| $ | 1,017,374 |  |  | $ | 1,132,536 |

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