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Organization, Basis of Presentation, and Significant Accounting Policies (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |
Minimum distribution of adjusted taxable income for deducting dividends from federally taxable income (as a percent) |  |  |  |  |  |  |  |  | 90.00% |  |
Minimum distribution of REIT taxable income for federal income tax exemption (as a percent) |  |  |  |  |  |  |  |  | 100.00% |  |
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 |
Excise and sales taxes |  |  |  |  |  |  |  |  | 0 | 0 | $ 0
Excise tax refund | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Income tax (benefit) expense |  |  |  |  |  |  |  |  | (160) | 141 | 305
Casualty and impairment loss (gain), net |  |  |  |  |  |  |  |  | 215 | 6,250 | (3,935)
Impairment of investment in unconsolidated entities |  |  |  |  |  |  |  |  | 0 | 0 | 0
Reconciliation of Income from Book Basis to Tax Basis Adjustment |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common stockholders | 385,734 | $ 192,486 | $ 254,662 | $ 141,643 | 237,573 | $ 238,248 | $ 165,225 | $ 235,875 | 974,525 | 876,921 | 1,034,002
GAAP gain on sale of communities in excess of tax gain |  |  |  |  |  |  |  |  | (194,596) | (86,661) | (195,029)
Depreciation/amortization timing differences on real estate |  |  |  |  |  |  |  |  | 5,431 | (3,642) | (947)
Amortization of debt/mark to market interest |  |  |  |  |  |  |  |  | 2,276 | (18,096) | (18,985)
Tax compensation expense (in excess of) less than GAAP |  |  |  |  |  |  |  |  | (612) | 3,912 | 9,821
Casualty and impairment loss (gain), net |  |  |  |  |  |  |  |  | 19,153 | 20,243 | (657)
Other adjustments |  |  |  |  |  |  |  |  | (4,905) | (4,304) | 11,533
Taxable net income |  |  |  |  |  |  |  |  | $ 801,272 | $ 788,373 | $ 839,738
Tax components of common stock dividends declared |  |  |  |  |  |  |  |  |  |  |
Ordinary income (as a percent) |  |  |  |  |  |  |  |  | 76.00% | 75.00% | 68.00%
20% capital gain (as a percent) |  |  |  |  |  |  |  |  | 11.00% | 18.00% | 26.00%
Capital gain tax rate (as a percent) |  |  |  |  |  |  |  |  | 20.00% | 20.00% | 20.00%
Unrecaptured 1250 gain (as a percent) |  |  |  |  |  |  |  |  | 13.00% | 7.00% | 6.00%
Unsecured notes |  |  |  |  |  |  |  |  |  |  |
Deferred Financing Costs |  |  |  |  |  |  |  |  |  |  |
Accumulated amortization of deferred finance costs | 20,564 |  |  |  | 16,984 |  |  |  | $ 20,564 | $ 16,984 |
Secured notes |  |  |  |  |  |  |  |  |  |  |
Deferred Financing Costs |  |  |  |  |  |  |  |  |  |  |
Accumulated amortization of deferred finance costs | 2,044 |  |  |  | 4,991 |  |  |  | 2,044 | 4,991 |
Variable rate unsecured credit facility |  |  |  |  |  |  |  |  |  |  |
Deferred Financing Costs |  |  |  |  |  |  |  |  |  |  |
Accumulated amortization of deferred finance costs | $ 10,108 |  |  |  | $ 8,299 |  |  |  | 10,108 | 8,299 |
Land |  |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Casualty and impairment loss (gain), net |  |  |  |  |  |  |  |  | $ 826 | $ 9,350 | $ 10,500
New England |  |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Casualty and impairment loss (gain), net |  |  |  |  |  |  |  |  |  |  | (5,732)
Deferred Financing Costs |  |  |  |  |  |  |  |  |  |  |
Insurance recoveries |  |  |  |  |  |  |  |  |  |  | $ 8,493

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