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Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Capitalized interest | $ 4.6 | $ 5.4 |
Capitalized real estate taxes | 1.6 | $ 0.9 |
Outstanding notes receivable | $ 17.0 |  | $ 13.2
Weighted average interest rate on outstanding notes receivable | 4.10% | 4.30% |
Remaining commitment under notes receivable | $ 4.6 |  |
General Partner of Consolidated Operating Partnerships, Ownership Interest | 1.00% |  |
Interest Expense [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reclassification from deferred financing charges |  | $ 0.4 |
Depreciation and Amortization [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reclassification from deferred financing charges |  | $ 0.4 |
Minimum [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Outstanding common limited partnership units, ownership interest | 92.00% |  |
Maximum [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Outstanding common limited partnership units, ownership interest | 94.00% |  |

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