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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 12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2011
Senior unsecured notes 6.75%
Dec. 31, 2013
Senior unsecured notes 6.75%
Dec. 31, 2012
Senior unsecured notes 6.75%
Jul. 31, 2012
Senior unsecured notes 6.75%
Dec. 31, 2012
Mortgage financing closed in August 2009
Dec. 31, 2011
Mortgage financing closed in August 2009
Aug. 31, 2009
Mortgage financing closed in August 2009
Dec. 31, 2013
Previous unsecured revolving credit facility
Dec. 31, 2012
Previous unsecured revolving credit facility
Dec. 31, 2011
Previous unsecured revolving credit facility
Sep. 30, 2013
Unsecured revolving credit facility
Jun. 30, 2011
Unsecured revolving credit facility
Aug. 31, 2012
Mortgages
Dec. 31, 2013
Mortgages
Dec. 31, 2012
Mortgages
Dec. 31, 2011
Mortgages
Dec. 31, 2011
Senior unsecured notes 7.875%
DEFERRED FINANCING FEES                                        
Issuance costs capitalized $ 3,326 $ 12,608 $ 13,760 $ 2,487   $ 44 $ 11,439   $ 37         $ 3,078 $ 6,723   $ 248 $ 1,125 $ 2,540 $ 1,973
Principal amount of debt         200,000 200,000 350,000     512,934                   250,000
Early repayment of debt variable portion               199,197               199,197        
Deferred financing fees and unamortized discounts written off                     538 3,897 427              
Unamortized gross balance of deferred financing fees 42,797 39,471                                    
Accumulated amortization related to deferred financing fees 14,822 10,061                                    
Weighted average amortization period of deferred financing fees 14 years 2 months 12 days                                      
Debt sold       300,000                                
Amortization of deferred financing fees                                        
Amortization expense in 2014 4,555                                      
Amortization expense in 2015 4,279                                      
Amortization expense in 2016 3,636                                      
Amortization expense in 2017 3,148                                      
Amortization expense in 2018 1,795                                      
Amortization expense thereafter $ 10,562