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Derivative Financial Instruments and Fair Value Measurements (Contingent Consideration Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Business Acquisition Contingent Consideration [Rollforward]        
Beginning Balance - Contingent Consideration $ (11,153) $ (15,051) $ (15,279) $ (21,010)
Business Combination, Consideration Transferred, Liabilities Incurred 0 0 0 0
Payments For Proceeds From Previous Acquisition 0 0 4,330 4,554
Fair Value of Contingent Consideration (83) (124) (287) 1,281
Ending Balance - Contingent Consideration $ (11,236) $ (15,175) $ (11,236) (15,175)
Niagara Natural [Member]        
Business Acquisition Contingent Consideration [Rollforward]        
Fair Value of Contingent Consideration       $ 1,700