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Real Estate Investments - Continuing Operations (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Real Estate Properties [Line Items]    
Real estate investment property, at cost $ 2,637,797 $ 2,470,953
Properties under development or held for future development 36,094 76,235
Office [Member]    
Real Estate Properties [Line Items]    
Real estate investment property, at cost 1,554,334 1,502,052
Properties under development or held for future development 18,711 36,379
Retail [Member]    
Real Estate Properties [Line Items]    
Real estate investment property, at cost 442,039 463,716
Properties under development or held for future development 1,076 500
Multifamily [Member]    
Real Estate Properties [Line Items]    
Real estate investment property, at cost 641,424 505,185
Properties under development or held for future development 16,307 39,356
7900 Westpark Drive [Member]    
Real Estate Properties [Line Items]    
Real estate investment property, at cost 25,900  
Properties under development or held for future development 10,200  
Six Fifty North Glebe Road [Member]    
Real Estate Properties [Line Items]    
Real estate investment property, at cost 19,200 31,300
Properties under development or held for future development 1,188 0
Variable Interest Entity, Consolidated, Carrying Amount, Assets $ 0 $ 17,947