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Investments in and Advances to Unconsolidated Affiliates - Unconsolidated Affiliates (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Combined and Condensed Balance Sheets |  |  |  |  |  |  |  |  |  |  |
Real estate under development | $ 173,702 |  |  |  | $ 543,486 |  |  |  | $ 173,702 | $ 543,486 |
Investments in and advances to unconsolidated affiliates | 302,070 |  |  |  | 272,028 |  |  |  | 302,070 | 272,028 |
Other assets | 214,959 |  |  |  | 192,786 |  |  |  | 214,959 | 192,786 |
Total assets | 3,960,247 |  |  |  | 3,995,960 |  |  |  | 3,960,247 | 3,995,960 |
Total liabilities and equity | 3,960,247 |  |  |  | 3,995,960 |  |  |  | 3,960,247 | 3,995,960 |
Investments in and advances to unconsolidated affiliates, net of Company's share of distributions in excess of income from and investments in unconsolidated affiliates | 286,778 |  |  |  | 258,337 |  |  |  | 286,778 | 258,337 |
Combined and Condensed Statements of Income |  |  |  |  |  |  |  |  |  |  |
Total revenues | 66,081 | $ 62,678 | $ 59,504 | $ 61,999 | 54,121 | $ 43,855 | $ 43,918 | $ 48,045 | 250,262 | 189,939 | $ 199,063
Operating and other expenses |  |  |  |  |  |  |  |  | (232,943) | (168,050) | (154,601)
Depreciation and amortization |  |  |  |  |  |  |  |  | (104,934) | (70,011) | (60,751)
Income from continuing operations before gain on disposition of properties |  |  |  |  |  |  |  |  | 15,422 | 52,627 | 60,907
Company’s equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 23,371 | 39,449 | 37,330
Equity Method Investee |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Related party revenue |  |  |  |  |  |  |  |  | 1,300 | 1,200 | 300
Expenses, related party |  |  |  |  |  |  |  |  | 2,000 | 2,400 | 2,500
Unconsolidated Affiliates |  |  |  |  |  |  |  |  |  |  |
Combined and Condensed Balance Sheets |  |  |  |  |  |  |  |  |  |  |
Rental property, net | 518,900 |  |  |  | 576,505 |  |  |  | 518,900 | 576,505 |
Real estate under development | 26,681 |  |  |  | 18,884 |  |  |  | 26,681 | 18,884 |
Investments in and advances to unconsolidated affiliates | 6,853 |  |  |  | 6,853 |  |  |  | 6,853 | 6,853 |
Other assets | 100,901 |  |  |  | 75,254 |  |  |  | 100,901 | 75,254 |
Total assets | 653,335 |  |  |  | 677,496 |  |  |  | 653,335 | 677,496 |
Mortgage notes payable | 405,652 |  |  |  | 407,344 |  |  |  | 405,652 | 407,344 |
Other liabilities | 61,932 |  |  |  | 30,117 |  |  |  | 61,932 | 30,117 |
Partners’ equity | 185,751 |  |  |  | 240,035 |  |  |  | 185,751 | 240,035 |
Total liabilities and equity | 653,335 |  |  |  | 677,496 |  |  |  | 653,335 | 677,496 |
Company's share of accumulated equity | 185,533 |  |  |  | 191,049 |  |  |  | 185,533 | 191,049 |
Basis differential | 95,358 |  |  |  | 61,827 |  |  |  | 95,358 | 61,827 |
Deferred fees, net of portion related to the Company's interest | 3,472 |  |  |  | 3,268 |  |  |  | 3,472 | 3,268 |
Amounts receivable by the Company | $ 2,415 |  |  |  | $ 2,193 |  |  |  | 2,415 | 2,193 |
Combined and Condensed Statements of Income |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 83,222 | 84,218 | 43,990
Operating and other expenses |  |  |  |  |  |  |  |  | (24,711) | (25,724) | (13,721)
Interest expense |  |  |  |  |  |  |  |  | (18,733) | (16,300) | (9,178)
Depreciation and amortization |  |  |  |  |  |  |  |  | (24,192) | (35,432) | (12,154)
Loss on debt extinguishment |  |  |  |  |  |  |  |  | (154) | 0 | 0
Gain (loss) on disposition of properties |  |  |  |  |  |  |  |  | 18,957 | (1,340) | 32,623
Income from continuing operations before gain on disposition of properties |  |  |  |  |  |  |  |  | 34,389 | 5,422 | 108,215
Company’s equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | 0 | 0 | 66,655
Operating Partnership, as General Partner or Managing Member |  |  |  |  |  |  |  |  |  |  |
Combined and Condensed Statements of Income |  |  |  |  |  |  |  |  |  |  |
Company’s share of equity in net income of unconsolidated affiliates |  |  |  |  |  |  |  |  | 26,039 | 40,538 | 37,722
Basis differential amortization |  |  |  |  |  |  |  |  | (2,668) | (1,089) | (392)
Company’s equity in earnings of unconsolidated affiliates |  |  |  |  |  |  |  |  | $ 23,371 | $ 39,449 | $ 37,330

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