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Fair Value Disclosures (Financial Assets And Liabilities Not Measured At Fair Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 23,825	$ 15,827	$ 130,343	$ 19,105
Restricted cash	13,383	10,299
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		15,827
Restricted cash		10,299
Mortgage notes payable	418,052	417,194
Lines of credit payable	105,000	50,000
Notes payable	743,181	743,149
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	23,825	15,827
Restricted cash	13,383	10,299
Mortgage notes payable	426,693	433,762
Lines of credit payable	105,000	50,000
Notes payable	753,816	782,042
2445 M Street [Member] \| Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
2445 M Street note receivable	3,849	4,404
2445 M Street [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
2445 M Street note receivable	$ 4,275	$ 5,113