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Line of Credit (Details) - Revolving Credit Facility [Member] - USD ($)
Jul. 07, 2017
Jun. 13, 2016
Jul. 20, 2017
Jun. 30, 2017
Line of Credit Facility [Line Items]        
Credit facility term of agreement   5 years    
Credit facility maximum borrowing capacity   $ 300,000,000    
Credit facility scheduled expiration date   Jun. 12, 2021    
Credit facility stated percentage   0.00%    
Credit facility accordion feature, increase limit   $ 100,000,000    
Credit facility amount outstanding at reporting date       $ 0
Subsequent Event [Member]        
Line of Credit Facility [Line Items]        
Credit facility borrowings $ 40,000,000      
Credit facility remaining borrowing capacity     $ 260,000,000  
London Interbank Offered Rate (LIBOR) [Member]        
Line of Credit Facility [Line Items]        
Credit facility variable interest rate basis spread (as a percent)   1.00%    
Credit facility description of variable rate basis   London InterBank Offered Rate    
Federal Funds Rate [Member]        
Line of Credit Facility [Line Items]        
Credit facility variable interest rate basis spread (as a percent)   0.50%    
Credit facility description of variable rate basis   Federal Funds Rate    
Minimum [Member]        
Line of Credit Facility [Line Items]        
Credit facility commitment fee per annum on daily unused portion (as a percent)   0.15%    
Minimum [Member] | Lender's Base Rate Plus Market Spread [Member]        
Line of Credit Facility [Line Items]        
Credit facility variable interest rate basis spread (as a percent)   0.25%    
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Line of Credit Facility [Line Items]        
Credit facility variable interest rate basis spread (as a percent)   1.25%    
Maximum [Member]        
Line of Credit Facility [Line Items]        
Credit facility commitment fee per annum on daily unused portion (as a percent)   0.30%    
Maximum [Member] | Lender's Base Rate Plus Market Spread [Member]        
Line of Credit Facility [Line Items]        
Credit facility variable interest rate basis spread (as a percent)   1.00%    
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Line of Credit Facility [Line Items]        
Credit facility variable interest rate basis spread (as a percent)   2.00%