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Employee Benefits - Projected Benefit Obligation and Change in Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Compensation and Retirement Disclosure [Abstract]      
Defined benefit plan, settlement, plan assets $ 4,300    
Change in projected benefit obligation:      
Projected benefit obligation at beginning of period 115,055 $ 121,955  
Service cost 996 1,104 $ 1,056
Interest cost 4,901 5,099 5,123
Actuarial (gain) loss 2,094 (8,460)  
Curtailment gain (181) (272)  
Benefits paid (9,429) (4,371)  
Projected benefit obligation at end of period 113,436 115,055 121,955
Change in plan assets:      
Fair value of assets at beginning of period 78,264 80,192  
Actual return on plan assets 4,868 (2,820)  
Employer contributions 5,384 5,263  
Benefits paid (9,429) (4,371)  
Fair value of assets at end of period 79,087 78,264 $ 80,192
Net unfunded status of plan $ (34,349) $ (36,791)