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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Capitalized interest | $ 3.7 | $ 3.8 | $ 7.4 | $ 8.3 |
Capitalized real estate taxes | 0.7 | $ 0.7 | 1.5 | $ 1.2 |
Outstanding notes receivable | 18.8 |  | $ 18.8 |  | $ 18.8
Weighted average interest rate on outstanding notes receivable |  |  | 4.00% | 4.00% |
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% |  |
In Place Leases [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Amortization of Intangible Assets | $ 3.6 |  | $ 5.5 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 7 months |  |  |  |
Net Below Market Leases [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Amortization of Intangible Assets | $ 0.1 |  | $ 0.2 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 5 months |  |  |  |

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