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Debt - Effect of Derivatives on Financial Statements (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Debt and Credit Arrangements    
Weighted average interest rates on debt, including impact of interest rate swaps 4.50% 3.50%
Interest paid, including payments made or received under the swaps $ 6,700,000 $ 4,900,000
Interest rate swap    
Debt and Credit Arrangements    
Portion of derivative asset that would be reclassified into earnings 396,000  
Interest income | Interest rate swap    
Debt and Credit Arrangements    
Amount of Gain or (Loss) Recognized in AOCI/AOCL on Derivative (3,955,000)  
Amount of Gain or (Loss) Reclassified from AOCI/AOCL into Income 148,000  
Total Net interest expense on Consolidated Statements of Operations $ (6,276,000)  
Interest expense | Interest rate swap    
Debt and Credit Arrangements    
Amount of Gain or (Loss) Recognized in AOCI/AOCL on Derivative   6,718,000
Amount of Gain or (Loss) Reclassified from AOCI/AOCL into Income   (108,000)
Total Net interest expense on Consolidated Statements of Operations   $ (5,075,000)
Estimate of period of time over which portion of derivative liability would be reclassified into earnings 12 months