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Summary of Significant Accounting Policies - Deferred Financing Fees (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
item
Oct. 31, 2014
USD ($)
item
Dec. 31, 2015
USD ($)
property
item
Dec. 31, 2014
USD ($)
Nov. 30, 2015
Sep. 30, 2015
USD ($)
May. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Sep. 30, 2013
USD ($)
DEFERRED FINANCING FEES                  
Number of properties acquired encumbering with assumed mortgage debt | property     9            
Principal amount of debt $ 1,750,000   $ 1,500,000 $ 1,750,000          
Deferred financing fees and unamortized discounts written off     70            
Repayments of borrowings under revolving credit facility     250,000            
Interest rate (as a percent)   5.875%              
Unamortized gross balance of deferred financing fees 22,782   50,477 22,782          
Accumulated amortization related to deferred financing fees 19,930   $ 50,479 19,930          
Weighted average amortization period of deferred financing fees     12 years 6 months            
Amortization of deferred financing fees                  
Amortization expense in 2016     $ 5,514            
Amortization expense in 2017     5,247            
Amortization expense in 2018     3,394            
Amortization expense in 2019     2,639            
Amortization expense in 2020     1,213            
Amortization expense thereafter     9,688            
Revolving Credit Facility                  
DEFERRED FINANCING FEES                  
Issuance costs capitalized     2,952     $ 1,200   $ 3,326 $ 248
Term Loan                  
DEFERRED FINANCING FEES                  
Issuance costs capitalized     1,752            
Principal amount of debt           200,000      
Term Loan Due In May 2014                  
DEFERRED FINANCING FEES                  
Issuance costs capitalized             $ 2,819    
Principal amount of debt             350,000    
Senior unsecured notes 4.30%                  
DEFERRED FINANCING FEES                  
Principal amount of debt 250,000     250,000          
Repayments of borrowings under revolving credit facility     $ 250,000            
Interest rate (as a percent)     4.30%   4.30%        
Senior unsecured notes 6.75%                  
DEFERRED FINANCING FEES                  
Principal amount of debt $ 200,000   $ 200,000 200,000          
Interest rate (as a percent)     6.75%            
Unsecured revolving credit facility                  
DEFERRED FINANCING FEES                  
Issuance costs capitalized                 $ 3,078
Mortgages                  
DEFERRED FINANCING FEES                  
Issuance costs capitalized             199    
Number of senior notes repaid | item 2 2 10            
Principal amount of debt     $ 82,569            
Early repayment of debt variable portion   $ 23,234   23,234          
Deferred financing fees and unamortized discounts written off     74 $ 357          
Interest rate (as a percent) 6.37% 6.25%   6.37%          
Senior notes issued in April 2014                  
DEFERRED FINANCING FEES                  
Issuance costs capitalized     8,039     $ 5,021      
Unsecured Debt                  
DEFERRED FINANCING FEES                  
Principal amount of debt     $ 350,000       $ 350,000