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Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Adjustment to cash and cash equivalents on the cash flow statement |  | $ 8,700,000 |  | $ 8,700,000 |
Adjustment to change in investing activities on the cash flow statement |  |  |  | 2,700,000 |
Capitalized interest | $ 3,400,000 | 4,500,000 | $ 11,600,000 | 13,800,000 |
Capitalized real estate taxes | 600,000 | $ 600,000 | 1,900,000 | $ 3,300,000 |
Outstanding notes receivable | $ 18,300,000 |  | $ 18,300,000 |  | $ 17,200,000
Weighted average interest rate on outstanding notes receivable |  |  | 4.00% | 4.10% |
Remaining commitment under notes receivable |  |  | $ 700,000 |  |
Camden Summit Partnership L P [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Outstanding common limited partnership units, ownership interest |  |  | 94.00% |  |
General Partner of Consolidated Operating Partnerships, Ownership Interest |  |  | 1.00% |  |
Camden Operating L P [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Outstanding common limited partnership units, ownership interest |  |  | 92.00% |  |
General Partner of Consolidated Operating Partnerships, Ownership Interest |  |  | 1.00% |  |

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