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Business Combinations (Unaudited Pro forma Information) (Details) - Parent Company [Member] - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Oct. 01, 2013
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Purchase price for Colonial merger | $ 0 | $ 0 | $ 2,162,876 |
Colonial |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, Purchase Price Allocation, Assets Acquired |  |  | 4,066,065 |
Business Acquisition, Purchase Price Allocation, Liabilities Assumed |  |  | (1,903,189) |
Purchase price for Colonial merger |  |  | 2,162,876 | $ 2,162,876
Land | Colonial |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  |  | 469,396 |
Building and Building Improvements | Colonial |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  |  | 3,080,858 |
Furniture Fixtures And Equipment | Colonial |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  |  | 96,377 |
Construction in Progress | Colonial |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  |  | 113,368 |
Unimproved Land | Colonial |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  |  | 58,400 |
Assets Held-for-sale | Colonial |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  |  | 33,300 |
Finite-Lived Intangible Assets, Major Class Name | Colonial |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  |  | 57,946 |
Cash and Cash Equivalents [Member] | Colonial |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  |  | 63,454 |
Restricted Cash | Colonial |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  |  | 6,825 |
Other Assets | Colonial |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Assets Acquired |  |  | 86,141 |
Debt | Colonial |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Liabilities Assumed |  |  | (1,759,550) |
Interest Rate Cash Flow Hedge Liability at Fair Value | Colonial |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Liabilities Assumed |  |  | (14,961) |
Other Liabilities | Colonial |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, PPA, Liabilities Assumed |  |  | $ (128,678) |

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