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Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
General Partner of Consolidated Operating Partnerships, Ownership Interest |  |  | 1.00% |  |
Capitalized interest | $ 4.7 | $ 5.2 | $ 9.3 | $ 10.6 |
Capitalized real estate taxes | 1.1 | 1.1 | 2.6 | $ 2.1 |
Outstanding notes receivable | $ 19.1 |  | $ 19.1 |  | $ 13.2
Weighted average interest rate on outstanding notes receivable |  |  | 4.10% | 4.20% |
Remaining commitment under notes receivable |  |  | $ 2.3 |  |
Interest Expense [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Reclassification from deferred financing charges |  | 0.4 |  | $ 0.9 |
Depreciation and Amortization [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Reclassification from deferred financing charges |  | $ 0.2 |  | $ 0.5 |
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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