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Redeemable Noncontrolling Interests (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Sep. 30, 2012
Partnership Interest [Member]
Sep. 30, 2011
Partnership Interest [Member]
Sep. 30, 2012
Partnership Interest [Member]
Sep. 30, 2011
Partnership Interest [Member]
Dec. 31, 2011
Partnership Interest [Member]
Sep. 30, 2012
Class B Common Units [Member]
Sep. 30, 2012
Long Term Incentive Plan [Member]
PartnershipUnit
Sep. 30, 2011
Long Term Incentive Plan [Member]
Sep. 30, 2012
Long Term Incentive Plan [Member]
Sep. 30, 2011
Long Term Incentive Plan [Member]
Mar. 31, 2012
Long Term Incentive Plan [Member]
May 31, 2011
Long Term Incentive Plan [Member]
Sep. 30, 2012
Long Term Incentive Plan [Member]
Minimum [Member]
Sep. 30, 2011
Long Term Incentive Plan [Member]
Minimum [Member]
Sep. 30, 2012
Long Term Incentive Plan [Member]
Maximum [Member]
Sep. 30, 2011
Long Term Incentive Plan [Member]
Maximum [Member]
Redeemable Noncontrolling Interest [Line Items]                                          
Dividend rate common units                     7.20%                    
Time period after issuance that common units may be redeemed (in years)                     1 year                    
Vesting periods, Minimum (in years)                                   3 years   5 years  
Common partnership unit per converted Long-Term Incentive Plan unit                       1                  
Issunance of LTIP units                           $ 5,700,000              
Value of units which had not reached full economic parity with the common units                               1,300,000 1,200,000        
Aggregate value of LTIP units on date of grant                           52,600,000              
Compensation expense 4,300,000 3,100,000 13,700,000 8,400,000               3,900,000 2,500,000 11,500,000 5,900,000            
Unamortized value of LTIP unit                       27,000,000   27,000,000              
Amortization period of LTIP unit (in years)                                     5 months 23 days   3 years 3 months
Redeemable noncontrolling interests in operating partnership 129,918,000   129,918,000   112,796,000 129,900,000   129,900,000   112,800,000                      
Percentage of ownership in operating partnership           12.58%   12.58%   11.40%                      
Carrying value of redeemable noncontrolling interests, including adjustments           84,400,000   84,400,000   66,400,000                      
Allocated net income (loss) to redeemable noncontrolling interests           (2,700,000) (2,900,000) (6,900,000) (1,200,000)                        
Cash distributions declared           $ 2,300,000 $ 2,000,000 $ 6,800,000 $ 5,800,000