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Derivatives (Interest Rate Swaps) (Details) - Interest Rate Swaps - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 24, 2018
Apr. 01, 2015
Derivative [Line Items]      
Derivative, fixed interest rate   6.19% [1] 4.85%
Interest Expense | Cash Flow Hedging      
Derivative [Line Items]      
Gain (loss) reclassified from accumulated other comprehensive income (loss) into income $ 1.5    
Senior Loans      
Derivative [Line Items]      
Derivative, floor interest rate at a future date   3.19%  
Senior Loans | Cash Flow Hedging      
Derivative [Line Items]      
Derivative, notional amount   $ 200.0 $ 220.0
[1] Upon refinancing our Term Loan B, the fixed interest rate will be 3.19 percent plus the new refinanced credit spread.