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Term Loans (Details)
1 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2018
USD ($)
Jan. 31, 2018
extension
Jan. 31, 2013
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Senior Unsecured Term Loans            
Debt            
Face amount of loan         $ 250,000,000.0  
Deferred finance costs balance         1,400,000 $ 580,000
Senior Unsecured Term Loans | $250 million senior term loan due March 2024            
Debt            
Face amount of loan $ 250,000,000.0          
Basis spread on variable rate (as a percent) 0.85%          
Effective yield (as a percent) 3.89%          
Deferred financing costs incurred         1,100,000  
Senior Unsecured Term Loans | $250 million senior unsecured term loan            
Debt            
Face amount of loan       $ 250,000,000    
Basis spread on variable rate (as a percent)       0.90%    
Deferred financing costs incurred         1,200,000  
Senior Unsecured Term Loans | $250 million senior unsecured term loan | Interest rate swaps            
Debt            
Effective yield (as a percent)       2.62%    
Senior Unsecured Term Loans | $70 million senior unsecured term loan | ARCT            
Debt            
Face amount of loan     $ 70,000,000      
Basis spread on variable rate (as a percent)   0.90% 1.10%      
Number of optional extension periods | extension   2        
Loan extension period   6 months        
Deferred financing costs incurred         $ 410,000  
Senior Unsecured Term Loans | $70 million senior unsecured term loan | ARCT | Interest rate swaps            
Debt            
Effective yield (as a percent)     2.05%      
Promissory Note | $125.9 million promissory note            
Debt            
Face amount of loan           $ 125,900,000
Stated interest rate (as a percent)           1.52%