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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 04, 2015
Jun. 28, 2014
Jul. 04, 2015
Jun. 28, 2014
The weighted average assumptions used to determine net periodic benefit cost are as follows:        
Contributions to noncontributory defined benefit plan     $ 540  
Expected contributions to noncontributory defined benefit plan for the remainder of the year     540  
Pension Benefits [Member]        
Components of Net Periodic Benefit Cost:        
Service cost $ 211 $ 213 422 $ 426
Interest cost 307 321 614 642
Expected return on plan assets (356) (370) (712) (740)
Recognized net actuarial loss 127 79 254 158
Amortization of prior service cost 14 14 28 28
Net periodic benefit cost $ 303 $ 257 $ 606 $ 514
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 $ 81 $ 112 $ 150
Interest cost 63 74 128 146
Expected return on plan assets (10) (12) (21) (24)
Recognized net actuarial loss 18 9 35 18
Amortization of prior service cost 24 24 46 45
Net periodic benefit cost $ 150 $ 176 $ 300 $ 335
The weighted average assumptions used to determine net periodic benefit cost are as follows:        
Discount rate (as a percentage) 3.75% 4.30% 3.75% 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) 2.99% 3.24% 2.99% 3.23%