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Debt (Schedule of Interest Rate Swaps and Details) (Details) - USD ($)
1 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 29, 2018
Jun. 30, 2017
Interest Rate Swap 3 [Member]      
Derivative [Line Items]      
Derivative, Term of Contract 3 years    
Derivative Liability, Notional Amount $ 200,000,000    
Notional Amount   $ 200,000,000  
Pay Fixed Rate   1.1325%  
Receive Current Floating Rate   2.1029%  
Fair Value, Asset   $ 5,756,000  
Interest Rate Swap [Member]      
Derivative [Line Items]      
Gain (Loss) Recognized In Income Ineffective Portion   0 $ 0
Reduction (Increase) to Interest Expense   600,000 $ (300,000)
Gain expected to be reclassified into earnings within the next twelve months   $ 2,500,000