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Term Loans (Details) - USD ($)
1 Months Ended 3 Months Ended
Jun. 30, 2015
Jan. 31, 2013
Mar. 31, 2016
Dec. 31, 2015
Credit facility        
Term loans     $ 318,908,000 $ 318,835,000
Unsecured debt        
Credit facility        
Term loans $ 250,000,000 $ 70,000,000    
Variable reference rate one month LIBOR one month LIBOR    
Variable interest rate, basis points spread over variable reference rate (as a percent) 0.95% 1.20%    
Maximum interest rate (as a percent) 2.67% 2.15%    
Deferred finance costs     1,100,000 $ 1,200,000
$250 million senior unsecured term loan        
Credit facility        
Deferred financing costs incurred     1,200,000  
$70 million senior unsecured term loan        
Credit facility        
Deferred financing costs incurred     $ 303,000