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Summary of Significant Accounting Policies (Details 4) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Dec. 31, 2011
Senior unsecured notes 6.75%
Apr. 30, 2010
Senior unsecured notes 6.75%
Dec. 31, 2011
Mortgage financing closed in August 2009
Dec. 31, 2010
Mortgage financing closed in August 2009
Dec. 31, 2011
Previous unsecured revolving credit facility
Jun. 30, 2011
Previous unsecured revolving credit facility
Dec. 31, 2010
Previous unsecured revolving credit facility
Y
Dec. 31, 2011
Unsecured revolving credit facility
Jun. 30, 2011
Unsecured revolving credit facility
Dec. 31, 2011
Mortgages
Apr. 30, 2010
Mortgages
May 31, 2010
Senior unsecured notes 7.875%
Dec. 31, 2010
Senior unsecured notes 7.875%
Dec. 31, 2011
Senior unsecured notes 7.875%
DEFERRED FINANCING FEES                                
Issuance costs capitalized $ 13,760 $ 4,661 $ 2,487 $ 2,907 $ 37 $ 903     $ 826   $ 6,723 $ 2,540 $ 25     $ 1,973
Principal amount of debt     300,000 200,000 512,934 512,934                   250,000
Period by which revolving credit facility has been extended (in years)                 1              
Maximum borrowing capacity of line of credit facility 1,500,000             550,000 550,000 750,000 750,000          
Deferred financing fees and unamortized discounts written off             427             1,153 1,153  
Stated interest rate (as a percent)     6.75% 6.75%                     7.875%  
Unamortized gross balance of deferred financing fees 36,144 28,159                            
Accumulated amortization related to deferred financing fees 10,710 11,897                            
Weighted average amortization period of deferred financing fees (in years) 6.5                              
Debt sold     300,000 200,000                        
Amortization of deferred financing fees                                
Amortization expense in 2012 4,695                              
Amortization expense in 2013 4,603                              
Amortization expense in 2014 4,543                              
Amortization expense in 2015 3,574                              
Amortization expense in 2016 2,189                              
Amortization expense after 2016 $ 5,830