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Credit Agreement (Details)
Feb. 26, 2016
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
Aug. 09, 2017
USD ($)
Credit Agreement        
Amount outstanding   $ 220,000,000    
Line of Credit | Credit Agreement        
Credit Agreement        
Principal amount $ 250,000,000.0     $ 350,000,000.0
Amount outstanding   $ 220,000,000 $ 170,000,000  
Margin rate (as a percent) 0.50%      
Maximum leverage ratio   3.0    
Minimum interest coverage ratio   3.0    
Line of Credit | Credit Agreement | Minimum        
Credit Agreement        
Commitment fee percentage (as a percent) 0.20%      
Line of Credit | Credit Agreement | Maximum        
Credit Agreement        
Commitment fee percentage (as a percent) 0.30%      
Line of Credit | Credit Agreement | Federal Funds Effective Rate        
Credit Agreement        
Variable rate spread (as a percent) 0.50%      
Line of Credit | Credit Agreement | Adjusted LIBOR        
Credit Agreement        
Variable rate spread (as a percent) 1.00%      
Margin rate (as a percent) 1.50%      
Outstanding Borrowing 1 [Member] | Line of Credit | Credit Agreement        
Credit Agreement        
Amount outstanding   $ 159,000,000    
Effective interest rate (as a percent)   4.00%    
Outstanding Borrowing 3 [Member] | Line of Credit | Credit Agreement        
Credit Agreement        
Amount outstanding   $ 61,000,000    
Effective interest rate (as a percent)   4.01%