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Summary of Significant Accounting Policies (Details 4) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Senior unsecured notes 6.75%
Jul. 31, 2012
Senior unsecured notes 6.75%
Dec. 31, 2011
Senior unsecured notes 6.75%
Apr. 30, 2010
Senior unsecured notes 6.75%
Dec. 31, 2012
Mortgage financing closed in August 2009
Dec. 31, 2011
Mortgage financing closed in August 2009
Dec. 31, 2010
Mortgage financing closed in August 2009
Dec. 31, 2012
Previous unsecured revolving credit facility
Dec. 31, 2011
Previous unsecured revolving credit facility
Dec. 31, 2010
Previous unsecured revolving credit facility
Jun. 30, 2011
Previous unsecured revolving credit facility
Dec. 31, 2012
Unsecured revolving credit facility
Jun. 30, 2011
Unsecured revolving credit facility
Aug. 31, 2012
Mortgages
Dec. 31, 2012
Mortgages
Oct. 31, 2012
Mortgages
Jun. 30, 2012
Mortgages
Feb. 29, 2012
Mortgages
Dec. 31, 2011
Mortgages
Apr. 30, 2010
Mortgages
Dec. 31, 2011
Senior unsecured notes 7.875%
DEFERRED FINANCING FEES                                                
Issuance costs capitalized $ 12,608 $ 13,760 $ 4,661 $ 44 $ 11,439   $ 2,907   $ 37 $ 903     $ 826     $ 6,723   $ 1,125       $ 2,540 $ 25 $ 1,973
Principal amount of debt       200,000 350,000 200,000 200,000   512,934 512,934                           250,000
Early repayment of debt variable portion               199,197                 199,197              
Period by which revolving credit facility has been extended                         1 year                      
Maximum borrowing capacity of line of credit facility                         550,000 550,000 750,000 750,000                
Deferred financing fees and unamortized discounts written off                     3,897 427 1,153                      
Stated interest rate (as a percent)       6.75%   6.75%             7.875%       6.40%   6.50% 6.07% 6.03%      
Unamortized gross balance of deferred financing fees 39,471 36,144                                            
Accumulated amortization related to deferred financing fees 10,061 10,710                                            
Weighted average amortization period of deferred financing fees 14 years 8 months 12 days                                              
Amortization of deferred financing fees                                                
Amortization expense in 2013 4,748                                              
Amortization expense in 2014 4,695                                              
Amortization expense in 2015 3,621                                              
Amortization expense in 2016 2,170                                              
Amortization expense in 2017 1,861                                              
Amortization expense thereafter $ 12,315