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Lines of Credit (Details) - Line of Credit [Member] - USD ($)
Jun. 13, 2016
Jun. 30, 2016
Line of Credit Facility [Line Items]    
Credit facility term 5 years  
Credit facility maximum borrowing capacity $ 300,000,000  
Credit facility expiration date Jun. 12, 2021  
Credit facility stated percentage 0.00%  
Credit facility accordion feature, increase limit $ 100,000,000  
Borrowings outstanding   $ 0
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%