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Debt (Revolving Credit Facility Under The Senior Credit Agreement) (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Jul. 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Aug. 04, 2017
Line of Credit Facility [Line Items]        
Repayments of revolving credit facility   $ 340,000 $ 110,000  
Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 1,000,000    
Line of credit facility, commitment fee   0.25%    
Revolving credit facility, maturity date   Feb. 05, 2020    
Borrowings on the revolving credit facility   $ 100,000    
Repayments of revolving credit facility   $ 340,000    
Revolving Credit Facility [Member] | Subsequent Event [Member]        
Line of Credit Facility [Line Items]        
Borrowings on the revolving credit facility $ 65,000      
Line of credit facility, outstanding       $ 215,000
Minimum [Member] | Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Basis spread on variable interest rate   1.375%    
Minimum [Member] | Revolving Credit Facility [Member] | Base Rate [Member]        
Line of Credit Facility [Line Items]        
Basis spread on variable interest rate   0.375%    
Maximum [Member] | Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Basis spread on variable interest rate   2.00%    
Maximum [Member] | Revolving Credit Facility [Member] | Base Rate [Member]        
Line of Credit Facility [Line Items]        
Basis spread on variable interest rate   1.00%