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Employee Benefits - Single-Employer Defined Benefit Pension Plan - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Compensation and Retirement Disclosure [Abstract]      
Unfunded status $ (34,349) $ (36,791)  
Gain (loss) adjustment to other comprehensive income (loss) net of tax (2,100) 400 $ (17,700)
Decrease in the unfunded obligation 2,400    
Actuarial gain 2,094 (8,460)  
Actual return on plan assets 4,868 (2,820)  
Employer contributions 5,384 $ 5,263  
Charge due to current year service and interest cost $ 5,900    
Change in discount rate 4.26% 4.52%  
Net periodic pension costs $ 799 $ 730 901
Estimated net loss expected to be amortized from accumulated other comprehensive loss into net periodic cost over the next fiscal year 1,000    
Accumulated benefit obligation for the hourly pension plan 112,300 114,000  
Hourly Savings Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, cost recognized 200 100 100
Salaried Savings Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, cost recognized $ 900 $ 900 $ 900