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Employee Benefits
 3 Months Ended
Apr. 01, 2017
Compensation and Retirement Disclosure [Abstract]  
Employee Benefits
Employee Benefits
Single-Employer Defined Benefit Pension Plan
The following table shows the components of net periodic pension cost (in thousands):
 
Three Months Ended
 
April 1, 2017
 
April 2, 2016
Service cost
$
183

 
$
252

Interest cost on projected benefit obligation
1,178

 
1,271

Expected return on plan assets
(1,584
)
 
(1,551
)
Amortization of unrecognized loss
268

 
223

Net periodic pension cost
$
45

 
$
195


Multiemployer Pension Plans
On March 25, 2017, we entered into a new collective bargaining agreement with the Lumber Employees Local 786 union, at our Chicago facility. As a result of the new agreement, we provided for a withdrawal from the related multi-employer pension plan, and, accordingly, recorded the $4.5 million net present value of this withdrawal liability on the Condensed Consolidated Balance Sheet in “other non-current liabilities,” and recorded an offsetting non-cash expense in the Condensed Consolidated Statement of Operations in “selling, general, and administrative” costs. We expect the liability to be paid over a 20-year period, with payments substantially similar on a total annual basis to those disclosed in our Annual Report on Form 10-K, Item 8, Note 9, for the year ended December 31, 2016.