4. BENEFIT PLANS

The following table provides the components of net periodic benefit costs for the Company-sponsored pension plans and other post-retirement benefits for the first quarters of 2014 and 2013.

	First Quarter Ended
	Pension Benefits						Other Benefits
	2014			2013			2014			2013
Components of net periodic benefit cost:
Service cost	$	14		$	15		$	4		$	5
Interest cost	56			48			4			5
Expected return on plan assets	(74		)	(69		)	—			—
Amortization of:
Prior service cost	—			—			(2		)	(1		)
Actuarial loss	16			31			(2		)	—

Net periodic benefit expense	$	12		$	25		$	4		$	9

The Company is not required and does not expect to make any contributions to the Company-sponsored defined benefit pension plans in 2014.

The Company contributed $56 and $48 to employee 401(k) retirement savings accounts in the first quarters of 2014 and 2013, respectively.

During the first quarter of 2014, the Company incurred a charge of $56 (after-tax) due to commitments and withdrawal liabilities arising from the restructuring of certain multiemployer pension plan obligations.

The Company also contributes to various multi-employer pension plans based on obligations arising from most of its collective bargaining agreements. These plans provide retirement benefits to participants based on their service to contributing employers. The Company recognizes expense in connection with these plans as contributions are funded.