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Mortgages and Notes Payable (Details) (USD $)
 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
7.05% Mortgage Loan due 2012 [Member]
Dec. 31, 2011
5.45% Mortgage Loan due 2014 [Member]
Dec. 31, 2011
5.18% Mortgage Loan due 2017 [Member]
Dec. 31, 2011
5.17% (6.43% effective rate) Mortage Loan due 2015 [Member]
Dec. 31, 2009
6.88% Mortgage Loan due 2016 [Member]
Dec. 31, 2009
7.50% Mortgage Loan due 2016 [Member]
Dec. 31, 2011
5.74% to 9.00% Mortgage Loans due between 2012 and 2016 [Member]
Dec. 31, 2010
5.74% to 9.00% Mortgage Loans due between 2012 and 2016 [Member]
Dec. 31, 2011
SF-Harborview Plaza, LP Joint Venture [Member]
Dec. 31, 2010
SF-Harborview Plaza, LP Joint Venture [Member]
Dec. 31, 2011
Highwoods-Markel Associates, LLC Joint Venture [Member]
Dec. 31, 2010
Highwoods-Markel Associates, LLC Joint Venture [Member]
Dec. 31, 2011
Variable Rate Construction Loan due 2012 [Member]
Dec. 31, 2011
5.85% (5.88% effective rate) Notes due 2017 [Member]
Dec. 31, 2010
5.85% (5.88% effective rate) Notes due 2017 [Member]
Dec. 31, 2011
Variable Rate Term Loan due 2016 [Member]
Dec. 31, 2010
Variable Rate Term Loans due 2011 [Member]
Dec. 31, 2011
Variable Rate Term Loans due 2011 [Member]
Dec. 31, 2009
Variable Rate Term Loans due 2011 [Member]
Dec. 31, 2011
Revolving Credit Facility due 2015 [Member]
Feb. 01, 2012
Revolving Credit Facility due 2015 [Member]
Dec. 31, 2011
Previous Unsecured Bank Term Loan [Member]
Dec. 31, 2010
Secured Mortgage Payable [Member]
Dec. 31, 2010
Secured Mortgage Payable [Member]
Dec. 31, 2009
8.125% Unsecured Notes due 2009 [Member]
Dec. 31, 2009
7.80% Two-Tranched Secured Loan [Member]
Dec. 31, 2009
Unsecured Notes [Member]
Dec. 31, 2011
Secured indebtedness [Member]
Dec. 31, 2010
Secured indebtedness [Member]
Dec. 31, 2011
Secured indebtedness [Member]
7.05% Mortgage Loan due 2012 [Member]
Dec. 31, 2010
Secured indebtedness [Member]
7.05% Mortgage Loan due 2012 [Member]
Dec. 31, 2011
Secured indebtedness [Member]
5.45% Mortgage Loan due 2014 [Member]
Dec. 31, 2010
Secured indebtedness [Member]
5.45% Mortgage Loan due 2014 [Member]
Dec. 31, 2011
Secured indebtedness [Member]
5.18% Mortgage Loan due 2017 [Member]
Dec. 31, 2010
Secured indebtedness [Member]
5.18% Mortgage Loan due 2017 [Member]
Dec. 31, 2011
Secured indebtedness [Member]
6.03% Mortgage Loan due 2013 [Member]
Dec. 31, 2010
Secured indebtedness [Member]
6.03% Mortgage Loan due 2013 [Member]
Dec. 31, 2011
Secured indebtedness [Member]
5.68% Mortgage Loan due 2013 [Member]
Dec. 31, 2010
Secured indebtedness [Member]
5.68% Mortgage Loan due 2013 [Member]
Dec. 31, 2011
Secured indebtedness [Member]
5.17% (6.43% effective rate) Mortage Loan due 2015 [Member]
Dec. 31, 2010
Secured indebtedness [Member]
5.17% (6.43% effective rate) Mortage Loan due 2015 [Member]
Dec. 31, 2011
Secured indebtedness [Member]
6.88% Mortgage Loan due 2016 [Member]
Dec. 31, 2010
Secured indebtedness [Member]
6.88% Mortgage Loan due 2016 [Member]
Dec. 31, 2011
Secured indebtedness [Member]
7.50% Mortgage Loan due 2016 [Member]
Dec. 31, 2010
Secured indebtedness [Member]
7.50% Mortgage Loan due 2016 [Member]
Dec. 31, 2011
Secured indebtedness [Member]
5.74% to 9.00% Mortgage Loans due between 2012 and 2016 [Member]
Dec. 31, 2010
Secured indebtedness [Member]
5.74% to 9.00% Mortgage Loans due between 2012 and 2016 [Member]
Dec. 31, 2011
Secured indebtedness [Member]
Variable Rate Construction Loan due 2012 [Member]
Dec. 31, 2010
Secured indebtedness [Member]
Variable Rate Construction Loan due 2012 [Member]
Dec. 31, 2011
Unsecured indebtedness [Member]
Dec. 31, 2010
Unsecured indebtedness [Member]
Dec. 31, 2011
Unsecured indebtedness [Member]
5.85% (5.88% effective rate) Notes due 2017 [Member]
Dec. 31, 2010
Unsecured indebtedness [Member]
5.85% (5.88% effective rate) Notes due 2017 [Member]
Dec. 31, 2011
Unsecured indebtedness [Member]
7.50% Notes due 2018 [Member]
Dec. 31, 2010
Unsecured indebtedness [Member]
7.50% Notes due 2018 [Member]
Dec. 31, 2011
Unsecured indebtedness [Member]
Variable Rate Term Loan due 2016 [Member]
Dec. 31, 2010
Unsecured indebtedness [Member]
Variable Rate Term Loan due 2016 [Member]
Dec. 31, 2011
Unsecured indebtedness [Member]
Variable Rate Term Loans due 2011 [Member]
Dec. 31, 2010
Unsecured indebtedness [Member]
Variable Rate Term Loans due 2011 [Member]
Dec. 31, 2011
Unsecured indebtedness [Member]
Revolving Credit Facility due 2015 [Member]
Dec. 31, 2010
Unsecured indebtedness [Member]
Revolving Credit Facility due 2015 [Member]
Debt Instrument [Line Items]                                                                                                                                
Mortgages and notes payable $ 1,903,213,000 $ 1,522,945,000                                                         $ 750,049,000 [1] $ 754,399,000 [1] $ 0 [2] $ 186,038,000 $ 67,809,000 [3] $ 0 [3] $ 123,613,000 [4] $ 0 [4] $ 125,264,000 $ 128,084,000 $ 110,343,000 $ 113,230,000 $ 40,015,000 [5] $ 40,199,000 [5] $ 112,075,000 $ 113,386,000 $ 46,181,000 $ 46,662,000 $ 72,640,000 [6],[7],[8] $ 74,691,000 [6],[7],[8] $ 52,109,000 [9] $ 52,109,000 [9] $ 1,153,164,000 $ 768,546,000 $ 391,164,000 [10] $ 391,046,000 [10] $ 200,000,000 $ 200,000,000 $ 200,000,000 [11] $ 0 $ 0 $ 147,500,000 $ 362,000,000 [12] $ 30,000,000
Scheduled future principal payments [Abstract]                                                                                                                                
Scheduled future principal payments, 2012 85,624,000                                                                                                                              
Scheduled future principal payments, 2013 245,917,000                                                                                                                              
Scheduled future principal payments, 2014 105,129,000                                                                                                                              
Scheduled future principal payments, 2015 406,995,000                                                                                                                              
Scheduled future principal payments, 2016 358,480,000                                                                                                                              
Scheduled future principal payments, thereafter 701,068,000                                                                                                                              
Total scheduled future principal payments 1,903,213,000 1,522,945,000                                                         750,049,000 [1] 754,399,000 [1] 0 [2] 186,038,000 67,809,000 [3] 0 [3] 123,613,000 [4] 0 [4] 125,264,000 128,084,000 110,343,000 113,230,000 40,015,000 [5] 40,199,000 [5] 112,075,000 113,386,000 46,181,000 46,662,000 72,640,000 [6],[7],[8] 74,691,000 [6],[7],[8] 52,109,000 [9] 52,109,000 [9] 1,153,164,000 768,546,000 391,164,000 [10] 391,046,000 [10] 200,000,000 200,000,000 200,000,000 [11] 0 0 147,500,000 362,000,000 [12] 30,000,000
Aggregate undepreciated book value of secured real estate assets                                                             1,200,000,000                                                                  
Unamortized fair market premium         400,000 5,500,000       300,000 400,000                                                                                                          
Unamortized fair market discount             1,700,000                   600,000 700,000                                                                                            
Mortgage debt related to consolidated affiliate 406,875,000 424,818,000                   21,000,000 21,500,000 34,000,000 35,000,000                                                                                                  
Maximum borrowing capacity on revolving credit facility                                             475,000,000                                                                                  
Maturity date on revolving credit facility                                             Jun. 27, 2015                                                                                  
Additional borrowing capacity on revolving credit facility                                             75,000,000                                                                                  
Term of optional extension (in years)                                             1                                                                                  
Interest rate                                             LIBOR plus 150 basis points                                                                                  
Annual facility fee (in hundredths)                                             0.35%                                                                                  
Amount outstanding on revolving credit facility                                             362,000,000 148,000,000                                                                                
Outstanding letters of credit on revolving credit facility                                             200,000 200,000                                                                                
Unused borrowing capacity on revolving credit facility                                             112,800,000 326,800,000                                                                                
Principal amount of debt               115,000,000 47,300,000                   200,000,000 20,000,000   20,000,000           50,000,000   8,200,000                                                                    
Term of debt instrument (in years)               6.5 7                   5 3 3 3                                                                                    
Scheduled maturity date       Jan. 01, 2012                                 Feb. 01, 2012                 Mar. 01, 2017                                                                    
Interest rate basis                                     LIBOR plus 220 basis points           LIBOR plus 110 basis points                                                                              
Interest rate, basis spread       7.05%       6.88% 7.50%             1.14%     2.49%   3.90% 3.90% 1.78%         8.125% 7.80% 5.85%                                                                    
Early repayment of debt       184,200,000                               10,000,000 10,000,000       137,500,000 5,800,000     107,200,000                                                                      
Rental residential units securing mortgage payable 96                                                 96 96                                                                          
Penalty incurred on early repayment of debt (24,000) (705,000) 1,287,000                                               600,000                                                                          
Lender covenant compliance to accelerate outstanding borrowings 66.70%                                                                                                                              
Holders covenant compliance of bonds 25.00%                                                                                                                              
Uncured covenant compliance default period 60                                                                                                                              
Capitalized Interest [Abstract]                                                                                                                                
Capitalized Interest $ 600,000 $ 1,400,000 $ 4,600,000                                                                                                                          
[1] The secured mortgage loans payable are collateralized by real estate assets with an aggregate undepreciated book value of approximately $1.2 billion at December 31, 2011. Our fixed rate mortgage loans generally are either locked out to prepayment for all or a portion of their term or are prepayable subject to certain conditions including prepayment penalties.
[2] We have repaid the remaining balance of this loan as of December 31, 2011.
[3] Includes unamortized fair market premium of $0.4 million as of December 31, 2011.
[4] Includes unamortized fair market premium of $5.5 million as of December 31, 2011
[5] Net of unamortized fair market value discount of $1.7 million as of December 31, 2011.
[6] Includes mortgage debt related to Markel, a consolidated 50.0% owned joint venture, of $34.0 million and $35.0 million at December 31, 2011 and 2010, respectively. See Note 10.
[7] Includes mortgage debt related to Harborview, a consolidated 20.0% owned joint venture, of $21.0 million and $21.5 million at December 31, 2011 and 2010, respectively. See Note 8.
[8] Net of unamortized fair market value premium of $0.3 million and $0.4 million at both December 31, 2011 and 2010.
[9] The interest rate is 1.14% at December 31, 2011.
[10] Net of unamortized original issuance discount of $0.6 million and $0.7 million at December 31, 2011 and 2010, respectively.
[11] The interest rate is 2.49% at December 31, 2011.
[12] The interest rate is 1.78% on our revolving credit facility at December 31, 2011.