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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 03, 2015
Sep. 27, 2014
Oct. 03, 2015
Sep. 27, 2014
The weighted average assumptions used to determine net periodic benefit cost are as follows:        
Contributions to noncontributory defined benefit plan     $ 810  
Expected contributions to noncontributory defined benefit plan for the remainder of the year     270  
Pension Benefits [Member]        
Components of Net Periodic Benefit Cost:        
Service cost $ 211 $ 213 633 $ 639
Interest cost 307 321 921 963
Expected return on plan assets (356) (370) (1,068) (1,110)
Recognized net actuarial loss 127 79 381 237
Amortization of prior service cost 15 14 42 42
Net periodic benefit cost $ 304 $ 257 $ 909 $ 771
The weighted average assumptions used to determine net periodic benefit cost are as follows:        
Discount rate (as a percentage) 3.87% 4.79% 3.87% 4.79%
Expected long-term return on plan assets (as a percentage) 5.25% 5.75% 5.25% 5.75%
Rate of compensation increase (as a percentage) 3.00% 3.50% 3.00% 3.50%
Other Benefits [Member]        
Components of Net Periodic Benefit Cost:        
Service cost $ 55 $ 73 $ 167 $ 223
Interest cost 62 74 190 220
Expected return on plan assets (10) (12) (31) (36)
Recognized net actuarial loss 17 9 52 27
Amortization of prior service cost 22 22 68 67
Net periodic benefit cost $ 146 $ 166 $ 446 $ 501
The weighted average assumptions used to determine net periodic benefit cost are as follows:        
Discount rate (as a percentage) 3.72% 4.28% 3.74% 4.28%
Expected long-term return on plan assets (as a percentage) 0.00% 0.00% 0.00% 0.00%
Rate of compensation increase (as a percentage) 2.98% 3.23% 2.99% 3.23%