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Investment in unconsolidated Joint Ventures (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
May 30, 2013
125 West 55th Street [Member]
Apr. 10, 2013
125 West 55th Street [Member]
sqft
Feb. 28, 2013
Annapolis Junction Building Six [Member]
sqft
May 31, 2013
500 North Capitol [Member]
Jun. 30, 2013
500 North Capitol [Member]
sqft
Apr. 04, 2013
Annapolis Junction Building Seven [Member]
Y
Apr. 10, 2013
Mountain View Research [Member]
Apr. 10, 2013
Mountain View Technology [Member]
Apr. 10, 2013
Mountain View Research And Technology Parks [Member]
Jun. 05, 2013
540 Madison Avenue [Member]
Apr. 10, 2013
Company [Member]
May 30, 2013
Company [Member]
125 West 55th Street [Member]
Apr. 10, 2013
Mountain View Research And Technology Parks [Member]
May 31, 2013
767 Fifth Avenue (The GM Building) [Member]
partners
sqft
Jun. 30, 2012
767 Fifth Avenue (The GM Building) [Member]
Apr. 10, 2013
Mountain View Technology [Member]
Apr. 10, 2013
Mountain View Research [Member]
May 31, 2013
Construction Loans [Member]
500 North Capitol [Member]
May 31, 2013
Construction Loans [Member]
Company [Member]
500 North Capitol [Member]
May 31, 2013
First Mortgage [Member]
500 North Capitol [Member]
Jun. 05, 2013
First Mortgage [Member]
540 Madison Avenue [Member]
Jun. 05, 2013
Prior to refinance first mortgage loan [Member]
540 Madison Avenue [Member]
Jun. 05, 2013
Prior to refinance first mortgage loan [Member]
Company [Member]
540 Madison Avenue [Member]
Schedule of Equity Method Investments [Line Items]                                                      
Number of Joint Venture Partners                                   2                  
Contractual Sales Price           $ 470,000,000                                          
Carrying Value of Debt Assumed in Sale         198,600,000                                            
Repayments of Notes Payable                                       3,700,000 8,600,000            
Debt Instrument, Basis Spread on Variable Rate                   1.65% 2.00% 2.50%                   1.65%     1.50%    
Maturity date         Mar. 10, 2020         Apr. 04, 2016 May 31, 2014 Nov. 22, 2014                   Oct. 14, 2014   Jun. 06, 2023 Jun. 05, 2018 Jul. 11, 2013  
Proceeds from Sale of Equity Method Investments     201,182,000 3,057,000 253,700,000                     152,200,000                      
Losses from early extinguishment of debt (152,000) (274,000) (152,000) (1,041,000)                 400,000   200,000             1,000,000 300,000     300,000 200,000
Proceeds from Issuance of Secured Debt                                               105,000,000 120,000,000    
Coupon/Stated Rate         6.09%                                     4.15%   5.20%  
Debt Instrument, Description of Variable Rate Basis               LIBOR plus 1.65%     LIBOR plus 2.00% LIBOR plus 2.50%   LIBOR plus 1.50%                          
Equity Method Investment, Ownership Percentage           60.00% 50.00% 30.00% 30.00% 50.00%       60.00%                          
Ownerhip upon acquistion                                 100.00%                    
Gain on consolidation of joint ventures 387,801,000 0 387,801,000 0                 24,400,000         363,400,000 363,400,000                
Construction Loan Facility Borrowing Capacity                   22,000,000                                  
Net Rentable Area           588,000 119,000   231,000                 1,800,000                  
Gain on sale or real estate         43,300,000                                            
Number of extensions                   2                                  
Repayments of Secured Debt     $ 79,865,000 $ 219,865,000                               $ 20,000,000 $ 90,000,000 $ 90,600,000       $ 118,000,000  
Extension Option (in years)                   1