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Fair Value Measurements (Reconciliation of Beginning and Ending Level 3 Net Liabilities) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Fair Value Disclosures [Abstract]        
Balance beginning of period $ (74,093,000) $ (64,076,000) $ (65,328,000) $ (63,201,000)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases 5,800,000 0.000 7,500,000 0.000
Payments 16,507,000 0 16,507,000 34,000
Change in fair value (included within selling, general and administrative expenses) (3,740,000) (651,000) (10,805,000) (1,560,000)
Balance end of period $ (67,126,000) $ (64,727,000) $ (67,126,000) $ (64,727,000)