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Debt (Revolving Credit Facility Under The Senior Credit Agreement) (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2016
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2015
Line of Credit Facility [Line Items]        
Repayments of revolving credit facility     $ 110,000 $ 535,000
Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity   $ 1,000,000 $ 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   70,000 $ 140,000  
Repayments of revolving credit facility   60,000 110,000  
Line of credit facility, outstanding   $ 30,000 $ 30,000  
Revolving Credit Facility [Member] | Subsequent Event [Member]        
Line of Credit Facility [Line Items]        
Repayments of revolving credit facility $ 30,000      
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%