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Real Estate Properties - Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Real Estate Properties |  |
Real estate property, gross | $ 7,824,763 | $ 7,617,547
Real estate property - accumulated depreciation | 1,454,477 | 1,270,716
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |
2018 | 585,229 |
2019 | 567,632 |
2020 | 538,631 |
2021 | 517,541 |
2022 | 500,190 |
Thereafter | 2,281,527 |
Land |  |
Real Estate Properties |  |
Real estate property, gross | 824,879 | 792,728
Buildings and Improvements |  |
Real Estate Properties |  |
Real estate property, gross | 6,675,516 | 6,519,145
Real estate property - accumulated depreciation | 1,250,057 | 1,092,498
Furniture, fixtures and equipment |  |
Real Estate Properties |  |
Real estate property, gross | 324,368 | 305,674
Real estate property - accumulated depreciation | $ 204,420 | $ 178,218

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