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Employee Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2016
Dec. 30, 2015
Dec. 31, 2014
Components of net periodic benefit cost [Abstract]      
Settlement loss recognized $ 24,297 $ 0 $ 0
Net periodic benefit cost 24,600 1,800 700
Pension Plan [Member]      
Components of net periodic benefit cost [Abstract]      
Service cost 105 380 380
Interest cost 0 2,983 3,099
Expected return on plan assets 0 (3,508) (3,953)
Amortization of net loss 0 1,733 924
Settlement loss recognized 24,297 0 0
Net periodic benefit cost 24,402 1,588 450
Other comprehensive (income) loss (23,955) (3,619) 10,141
Other Defined Benefit Plans [Member]      
Components of net periodic benefit cost [Abstract]      
Service cost 0 0  
Interest cost 91 107 123
Amortization of net loss 85 79 66
Settlement loss recognized 0 0 50
Net periodic benefit cost 176 186 239
Other comprehensive (income) loss $ (12) $ (36) $ 182