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Subsequent Events (Textual) (Details) - Revolving Credit Facility [Member]
6 Months Ended
Jul. 17, 2018
USD ($)
Extension
Jun. 30, 2018
USD ($)
Subsequent Event [Line Items]    
Maximum borrowing capacity   $ 600,000,000
Variable interest rate   1.20%
Subsequent Event [Member]    
Subsequent Event [Line Items]    
Debt instrument maturity date May 15, 2019  
Subsequent Event [Member] | New Credit Facility [Member]    
Subsequent Event [Line Items]    
Maximum borrowing capacity $ 600,000,000  
Debt instrument maturity date Jul. 15, 2022  
Debt instrument, maturity extension period 6 months  
Debt instrument, number of extensions | Extension 2  
Subsequent Event [Member] | New Credit Facility [Member] | Eurodollar Loans [Member] | Minimum [Member]    
Subsequent Event [Line Items]    
Variable interest rate 0.825%  
Subsequent Event [Member] | New Credit Facility [Member] | Eurodollar Loans [Member] | Maximum [Member]    
Subsequent Event [Line Items]    
Variable interest rate 1.55%