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%