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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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 expense |  |  |  |  |  |  |  |  | 305 | 1,483 | 9,368
Casualty and impairment (gain) loss, net |  |  |  |  |  |  |  |  | (3,935) | (10,542) | 0
Other than Temporary Impairment Losses, Investments |  |  |  |  |  |  |  |  | 0 | 0 | 0
Reconciliation of Income from Book Basis to Tax Basis Adjustment |  |  |  |  |  |  |  |  |  |  |
Net income attributable to common stockholders | 242,235 | $ 356,392 | $ 197,444 | $ 237,931 | 155,428 | $ 206,142 | $ 172,324 | $ 208,144 | 1,034,002 | 742,038 | 683,567
GAAP gain on sale of communities (in excess of) less than tax gain |  |  |  |  |  |  |  |  | (204,767) | (20,900) | 22,127
Depreciation/amortization timing differences on real estate |  |  |  |  |  |  |  |  | (10,183) | (24,657) | (10,735)
Amortization of debt/mark to market interest |  |  |  |  |  |  |  |  | (19,763) | (64,676) | (38,202)
Tax compensation expense less than (in excess of) GAAP |  |  |  |  |  |  |  |  | 5,592 | (1,244) | (5,252)
Casualty and impairment (gain) loss, net |  |  |  |  |  |  |  |  | (3,935) | (10,542) | 0
Other adjustments |  |  |  |  |  |  |  |  | (10) | (12,829) | 14,323
Taxable net income |  |  |  |  |  |  |  |  | $ 800,936 | $ 607,190 | $ 665,828
Tax components of common stock dividends declared |  |  |  |  |  |  |  |  |  |  |
Ordinary income (as a percent) |  |  |  |  |  |  |  |  | 68.00% | 83.00% | 62.00%
20% capital gain (as a percent) |  |  |  |  |  |  |  |  | 26.00% | 12.00% | 29.00%
Capital gain tax rate (as a percent) |  |  |  |  |  |  |  |  | 20.00% | 20.00% | 20.00%
Unrecaptured 1250 gain (as a percent) |  |  |  |  |  |  |  |  | 6.00% | 5.00% | 9.00%
Unsecured notes |  |  |  |  |  |  |  |  |  |  |
Deferred Financing Costs |  |  |  |  |  |  |  |  |  |  |
Accumulated amortization of deferred finance costs | 14,008 |  |  |  | 11,995 |  |  |  | $ 14,008 | $ 11,995 |
Secured notes |  |  |  |  |  |  |  |  |  |  |
Deferred Financing Costs |  |  |  |  |  |  |  |  |  |  |
Accumulated amortization of deferred finance costs | 10,562 |  |  |  | 12,315 |  |  |  | 10,562 | 12,315 |
Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |
Deferred Financing Costs |  |  |  |  |  |  |  |  |  |  |
Accumulated amortization of deferred finance costs | $ 6,490 |  |  |  | $ 4,967 |  |  |  | 6,490 | $ 4,967 |
New England [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Casualty and impairment (gain) loss, net |  |  |  |  |  |  |  |  | (5,732) |  |
Deferred Financing Costs |  |  |  |  |  |  |  |  |  |  |
Insurance Proceeds |  |  |  |  |  |  |  |  | $ 8,493 |  |

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