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Line of Credit (Details) - Revolving Credit Facility [Member] - USD ($)
 1 Months Ended
Jun. 13, 2016
Apr. 19, 2018
Jul. 31, 2017
Mar. 31, 2018
Line of Credit Facility [Line Items]        
Credit facility term of agreement 5 years      
Credit facility maximum borrowing capacity $ 300,000,000      
Credit facility stated percentage 0.00%      
Credit facility accordion feature, increase limit $ 100,000,000      
Credit facility borrowings     $ 40,000,000  
Credit facility amount outstanding at reporting date       $ 20,000,000
Subsequent Event [Member]        
Line of Credit Facility [Line Items]        
Credit facility principal payment   $ 20,000,000    
Credit facility remaining borrowing capacity   $ 300,000,000    
London Interbank Offered Rate (LIBOR) [Member]        
Line of Credit Facility [Line Items]        
Credit facility variable interest rate basis spread (as a percent) 1.00%      
Federal Funds Rate [Member]        
Line of Credit Facility [Line Items]        
Credit facility variable interest rate basis spread (as a percent) 0.50%      
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%