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Co-investments - Combined Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Equity Method Investment, Summarized Financial Information, Assets [Abstract] |  |  |  |  |
Rental properties and real estate under development | $ 313,825 |  | $ 313,825 |  | $ 190,505
Other liabilities | 33,733 |  | 33,733 |  | 32,922
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |
Interest expense | (55,938) | $ (56,693) | (167,333) | $ (164,727) |
General and administrative | (9,788) | (9,647) | (30,726) | (28,527) |
Total co investment [Member] |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Assets [Abstract] |  |  |  |  |
Rental properties and real estate under development | 3,671,101 |  | 3,671,101 |  | 3,807,245
Other assets | 111,372 |  | 111,372 |  | 121,505
Total assets | 3,782,473 |  | 3,782,473 |  | 3,928,750
Debt | 1,597,597 |  | 1,597,597 |  | 1,617,639
Other liabilities | 65,865 |  | 65,865 |  | 74,607
Equity | 2,119,011 |  | 2,119,011 |  | 2,236,504
Total liabilities and equity | 3,782,473 |  | 3,782,473 |  | 3,928,750
Company's share of equity | 1,088,332 |  | 1,088,332 |  | $ 1,161,275
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |
Property revenues | 76,303 | 72,124 | 224,319 | 216,434 |
Property operating expenses | (27,753) | (24,976) | (79,028) | (75,377) |
Net operating income | 48,550 | 47,148 | 145,291 | 141,057 |
Gain on sale of real estate | 10,058 | 0 | 10,058 | 28,291 |
Interest expense | (13,718) | (10,978) | (39,663) | (35,260) |
General and administrative | (2,452) | (1,496) | (6,147) | (4,276) |
Depreciation and amortization | (27,884) | (25,569) | (84,211) | (79,676) |
Net income | 14,554 | 9,105 | 25,328 | 50,136 |
Company's share of net income | 19,727 | 9,568 | 40,934 | 38,932 |
Total co investment [Member] | Affiliated Entity [Member] |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |
Company's share of net income | $ 500 | $ 800 | $ 1,500 | $ 2,500 |

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