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Secured Notes Payable (Schedule Of Secured Notes Payable) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Secured loan amount $ 3,441,140,000 $ 3,623,096,000
Unamortized Loan Premium 0 [1] 1,060,000 [1]
Secured notes payable, total 3,441,140,000 3,624,156,000
Weighted average remaining life of total outstanding debt (in years) 5.5  
Debt at fixed interest rate 3,310,000,000  
Weighted average remaining life of interest rate swaps and fixed rate debt (in years) 5.7  
Weighted average interest rate 4.09%  
Effective weighted average interest rate 4.20%  
Effective Fixed Rate Loans [Member]
    
Debt Instrument [Line Items]    
Secured loan amount 2,168,080,000 2,268,080,000
Effective Annual Fixed Interest Rate 4.07% [2]  
Fixed Rate Loans [Member]
    
Debt Instrument [Line Items]    
Secured loan amount 1,145,000,000 705,000,000
Effective Annual Fixed Interest Rate 4.15% [2]  
Variable Rate Loans [Member]
    
Debt Instrument [Line Items]    
Secured loan amount 128,060,000 650,016,000
Term Loan With Maturity Date 8/31/2012 [Member]
    
Debt Instrument [Line Items]    
Maturity Date Aug. 31, 2012  
Secured loan amount 0 521,956,000
Variable Interest Rate LIBOR + 0.85%  
Term Loan With Maturity Date 3/3/2014 [Member]
    
Debt Instrument [Line Items]    
Maturity Date Mar. 03, 2014  
Secured loan amount 16,140,000 [3] 16,140,000 [3]
Variable Interest Rate LIBOR + 1.85%  
Fannie Mae Loan With Interest Rate At 0.707% BPS Over DMBS [Member]
    
Debt Instrument [Line Items]    
Maturity Date Feb. 01, 2015  
Secured loan amount 111,920,000 [4] 111,920,000 [4]
Variable Interest Rate DMBS + 0.707%  
Term Loan With Effective Annual Fixed Interest Rate At 4.76% [Member]
    
Debt Instrument [Line Items]    
Maturity Date Apr. 01, 2015  
Secured loan amount 240,000,000 340,000,000
Variable Interest Rate LIBOR +1.50%  
Effective Annual Fixed Interest Rate 4.76% [2]  
Swap Maturity Date Jan. 02, 2013  
TermLoanWithMaturityDateOf3/1/2016 [Member]
    
Debt Instrument [Line Items]    
Maturity Date Mar. 01, 2016  
Secured loan amount 82,000,000 82,000,000
Variable Interest Rate LIBOR + 0.62%  
Effective Annual Fixed Interest Rate 3.92% [2]  
Swap Maturity Date Jan. 02, 2013  
TermLoanWithMaturityDateOf6/1/2017 [Member]
    
Debt Instrument [Line Items]    
Maturity Date Jun. 01, 2017  
Secured loan amount 18,000,000 18,000,000
Variable Interest Rate LIBOR + 0.62%  
Effective Annual Fixed Interest Rate 3.92% [2]  
Swap Maturity Date Jan. 02, 2013  
Term Loan With Effective Annual Fixed Interest Rate At 4.45% [Member]
    
Debt Instrument [Line Items]    
Maturity Date Oct. 02, 2017  
Secured loan amount 400,000,000 400,000,000
Variable Interest Rate LIBOR + 2.00%  
Effective Annual Fixed Interest Rate 4.45% [2]  
Swap Maturity Date Jul. 01, 2015  
Term Loan With Effective Annual Fixed Interest Rate At 4.12% [Member]
    
Debt Instrument [Line Items]    
Maturity Date Apr. 02, 2018  
Secured loan amount 510,000,000 510,000,000
Variable Interest Rate LIBOR + 2.00%  
Effective Annual Fixed Interest Rate 4.12% [2]  
Swap Maturity Date Apr. 01, 2016  
Term Loan With Effective Annual Fixed Interest Rate At 3.74% [Member]
    
Debt Instrument [Line Items]    
Maturity Date Aug. 01, 2018  
Secured loan amount 530,000,000 530,000,000
Variable Interest Rate LIBOR + 1.70%  
Effective Annual Fixed Interest Rate 3.74% [2]  
Swap Maturity Date Aug. 01, 2016  
Term Loan With Effective Annual Fixed Interest Rate At 4.14% [Member]
    
Debt Instrument [Line Items]    
Maturity Date Aug. 05, 2018  
Secured loan amount 355,000,000 [5] 355,000,000 [5]
Effective Annual Fixed Interest Rate 4.14% [2]  
Debt instrument period of monthly interest-only payments end date Feb. 05, 2016  
Amortization period, (in years) 30  
Term Loan With Effective Annual Fixed Interest Rate At 4.00% [Member]
    
Debt Instrument [Line Items]    
Maturity Date Feb. 01, 2019  
Secured loan amount 155,000,000 [6] 0
Effective Annual Fixed Interest Rate 4.00% [2]  
Debt instrument period of monthly interest-only payments end date Feb. 01, 2015  
Amortization period, (in years) 30  
Long term Fixed Rate Debt with effective interest rate of 385 bps [Member]
    
Debt Instrument [Line Items]    
Maturity Date Jun. 05, 2019  
Secured loan amount 285,000,000 [7] 0
Effective Annual Fixed Interest Rate 3.85% [2]  
Debt instrument period of monthly interest-only payments end date Feb. 05, 2017  
Amortization period, (in years) 30  
Term Loan With Effective Annual Fixed Interest Rate At 4.46% [Member]
    
Debt Instrument [Line Items]    
Maturity Date Mar. 01, 2020 [8]  
Secured loan amount 350,000,000 [8],[9] 350,000,000 [9]
Effective Annual Fixed Interest Rate 4.46% [2]  
Debt instrument period of monthly interest-only payments end date Mar. 01, 2014  
Amortization period, (in years) 30  
Number Of One-Year Extension Option Contracts 2  
Debt instrument period of fixed interest end date Mar. 01, 2018  
Fannie Mae Loan With Effective Annual Fixed Interest Rate At 3.65% [Member]
    
Debt Instrument [Line Items]    
Maturity Date Nov. 02, 2020  
Secured loan amount 388,080,000 388,080,000
Variable Interest Rate LIBOR + 1.65%  
Effective Annual Fixed Interest Rate 3.65% [2]  
Swap Maturity Date Nov. 01, 2017  
Fannie Mae Loan With Interest Rate At 0.76% Over DMBS [Member]
    
Debt Instrument [Line Items]    
Secured loan amount 75,000,000  
Fannie Mae Loan With Interest Rate At 0.60% Over DMBS [Member]
    
Debt Instrument [Line Items]    
Secured loan amount $ 36,900,000  
Fixed Interest Rate Loan [Member]
    
Debt Instrument [Line Items]    
Weighted average remaining period for fixed rate debt (in years) 4.1  
London Interbank Offered Rate (LIBOR) [Member] | Term Loan With Maturity Date 8/31/2012 [Member]
    
Debt Instrument [Line Items]    
Basis ppread on variable rate 0.00850  
London Interbank Offered Rate (LIBOR) [Member] | Term Loan With Maturity Date 3/3/2014 [Member]
    
Debt Instrument [Line Items]    
Basis ppread on variable rate 0.01850  
London Interbank Offered Rate (LIBOR) [Member] | Term Loan With Effective Annual Fixed Interest Rate At 4.76% [Member]
    
Debt Instrument [Line Items]    
Basis ppread on variable rate 0.01500  
London Interbank Offered Rate (LIBOR) [Member] | TermLoanWithMaturityDateOf3/1/2016 [Member]
    
Debt Instrument [Line Items]    
Basis ppread on variable rate 0.00620  
London Interbank Offered Rate (LIBOR) [Member] | TermLoanWithMaturityDateOf6/1/2017 [Member]
    
Debt Instrument [Line Items]    
Basis ppread on variable rate 0.00620  
London Interbank Offered Rate (LIBOR) [Member] | Term Loan With Effective Annual Fixed Interest Rate At 4.45% [Member]
    
Debt Instrument [Line Items]    
Basis ppread on variable rate 0.02000  
London Interbank Offered Rate (LIBOR) [Member] | Term Loan With Effective Annual Fixed Interest Rate At 4.12% [Member]
    
Debt Instrument [Line Items]    
Basis ppread on variable rate 0.02000  
London Interbank Offered Rate (LIBOR) [Member] | Term Loan With Effective Annual Fixed Interest Rate At 3.74% [Member]
    
Debt Instrument [Line Items]    
Basis ppread on variable rate 0.01700  
London Interbank Offered Rate (LIBOR) [Member] | Fannie Mae Loan With Effective Annual Fixed Interest Rate At 3.65% [Member]
    
Debt Instrument [Line Items]    
Basis ppread on variable rate 0.01650  
DMBS [Member] | Fannie Mae Loan With Interest Rate At 0.707% BPS Over DMBS [Member]
    
Debt Instrument [Line Items]    
Basis ppread on variable rate 0.00707  
DMBS [Member] | Fannie Mae Loan With Interest Rate At 0.76% Over DMBS [Member]
    
Debt Instrument [Line Items]    
Basis ppread on variable rate 0.0076  
DMBS [Member] | Fannie Mae Loan With Interest Rate At 0.60% Over DMBS [Member]
    
Debt Instrument [Line Items]    
Basis ppread on variable rate 0.0060  
[1] Represents non-cash mark-to-market adjustment on variable rate debt associated with office properties.
[2] Includes the effect of interest rate contracts as of December 31, 2012, and excludes amortization of loan fees, all shown on an actual/360-day basis.
[3] The borrower is a consolidated entity in which our operating partnership owns a two-thirds interest.
[4] The loan has a $75.0 million tranche bearing interest at DMBS + 0.76% and a $36.9 million tranche bearing interest at DMBS + 0.60%.
[5] Interest-only until February 2016, with principal amortization thereafter based upon a 30-year amortization table.
[6] Interest-only until February 2015, with principal amortization thereafter based upon a 30-year amortization table.
[7] Interest only until February 2017, with principal amortization thereafter based upon a 30-year amortization table.
[8] We have 2 one-year extension options, which would extend the maturity to March 1, 2020 from March 1, 2018, subject to meeting certain conditions.
[9] Interest at a fixed interest rate until March 1, 2018 and a floating rate thereafter, with interest-only payments until March 2014 and payments thereafter based upon a 30-year amortization table.