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Business Combinations (Unaudited Pro forma Information) (Details) - Parent Company [Member] - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 01, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Purchase price for Colonial merger | $ 4,006,586 |  | $ 0 | $ 0
Post [Member] [Domain] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, Purchase Price Allocation, Assets Acquired |  | $ 4,746,963 |  |
Business Acquisition, Purchase Price Allocation, Liabilities Assumed |  | (738,071) |  |
Purchase price for Colonial merger |  | 4,006,586 |  |
Land | Post [Member] [Domain] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  | 875,737 |  |
Building and Building Improvements | Post [Member] [Domain] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  | 3,401,983 |  |
Furniture Fixtures And Equipment | Post [Member] [Domain] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  | 81,389 |  |
Construction in Progress | Post [Member] [Domain] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  | 184,044 |  |
Unimproved Land | Post [Member] [Domain] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  | 24,200 |  |
Assets Held-for-sale | Post [Member] [Domain] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  | 3,610 |  |
Real Estate Investment [Member] | Post [Member] [Domain] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  | 44,435 |  |
Finite-Lived Intangible Assets, Major Class Name | Post [Member] [Domain] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  | 53,192 |  |
Cash and Cash Equivalents [Member] | Post [Member] [Domain] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  | 34,292 |  |
Restricted Cash | Post [Member] [Domain] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  | 3,608 |  |
Other Assets | Post [Member] [Domain] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  | 40,473 |  |
Debt | Post [Member] [Domain] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Liabilities Assumed |  | (595,609) |  |
Interest Rate Cash Flow Hedge Liability at Fair Value | Post [Member] [Domain] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Liabilities Assumed |  | (2,118) |  |
Other Current Liabilities [Member] | Post [Member] [Domain] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  | (1,661) |  |
Other Liabilities | Post [Member] [Domain] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Liabilities Assumed |  | (138,683) |  |
Noncontrolling Interest | Post [Member] [Domain] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Liabilities Assumed |  | $ (2,306) |  |

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