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Leases (Tables) | 12 Months Ended
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Dec. 31, 2018
Leases [Abstract] |
Schedule of Future Minimum Rental Revenues and Payments for Operating and Capital Leases | The scheduled future minimum (i) rental revenues from rental properties under the terms of non-cancelable tenant leases greater than one year (assuming no new or renegotiated leases or option extensions for such premises) and (ii) rental payments under the terms of all non-cancelable operating and capital leases in which the Company is the lessee, principally for office space, land and equipment, as of December 31, 2018, are summarized as follows (in thousands):
Year Ending December 31, |  | Minimum Rental Revenues |  |  | Minimum Rental Payments |
2019 |  | $ | 187,158 |  |  | $ | 4,775 |
2020 |  |  | 178,691 |  |  |  | 4,571 |
2021 |  |  | 159,749 |  |  |  | 4,354 |
2022 |  |  | 139,294 |  |  |  | 4,404 |
2023 |  |  | 121,456 |  |  |  | 4,425 |
Thereafter |  |  | 513,853 |  |  |  | 180,618 |
Total |  | $ | 1,300,201 |  |  | $ | 203,147 |

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