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Fair Value Disclosures (Financial Assets And Liabilities Not Measured At Fair Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 11,305	$ 23,825	$ 15,827	$ 130,343
Restricted cash	6,317	13,383
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		23,825
Restricted cash		13,383
Mortgage notes payable	148,540	418,052
Lines of credit payable	120,000	105,000
Notes payable	843,084	743,181
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	11,305	23,825
Restricted cash	6,317	13,383
Mortgage notes payable	149,997	426,693
Lines of credit payable	120,000	105,000
Notes payable	873,516	753,816
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	2,089	3,849
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	$ 2,173	$ 4,275