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Revolving Credit Facilities (Details) - Revolving Credit Facility - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2016
Oct. 31, 2017
Debt Instrument [Line Items]    
Credit agreement term 5 years  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.15%
Credit available under borrowing agreement $ 80  
Additional borrowing capacity $ 50  
Maximum [Member]    
Debt Instrument [Line Items]    
Quarterly consolidated leverage ratio   2.50%
Minimum [Member]    
Debt Instrument [Line Items]    
Quarterly consolidated leverage ratio   1.15%
LIBOR | Maximum [Member]    
Debt Instrument [Line Items]    
Applicable margin (as a percent)   1.50%
LIBOR | Minimum [Member]    
Debt Instrument [Line Items]    
Applicable margin (as a percent)   1.00%
Base Rate | Maximum [Member]    
Debt Instrument [Line Items]    
Applicable margin (as a percent)   0.50%
Base Rate | Minimum [Member]    
Debt Instrument [Line Items]    
Applicable margin (as a percent)   0.00%