Defined Pension Benefit Plans

3 Months Ended

Mar. 31, 2013

General Discussion of Pension and Other Postretirement Benefits [Abstract]

Defined Pension Benefit Plans

Defined Pension Benefit Plans

We maintain two pension benefit plans, a qualified noncontributory defined benefit plan and a nonqualified, noncontributory defined benefit supplemental plan that provides benefits to certain retired highly compensated officers and employees. To date, the supplemental plan remains an unfunded plan. These plans include significant pension benefit obligations which are calculated based on actuarial valuations. Key assumptions are made in determining these obligations and related expenses, including expected rates of return on plan assets and discount rates. Benefits are based primarily on years of service and employees’ compensation.

As of July 1, 2006, in connection with a revision to our retirement plan, we froze the pension benefits of our qualified noncontributory plan participants. Under the revised plan, such participants generally do not accrue any additional benefits under the defined benefit plan after July 1, 2006.

During the three months ended March 31, 2013, we made cash contributions of $0.4 million to our qualified defined benefit pension plan. Additionally, substantially all of our U.S. employees are eligible to participate in a 401(k) savings plan. Under this plan, we make a core contribution and match a specified percentage of employee contributions, subject to certain limitations.

The components of net pension benefit expense are as follows (In thousands):

	Three Months Ended
	March 31, 2013			April 1, 2012
Service cost-benefits earned	$	—		$	52
Interest cost on benefits obligation	491			513
Estimated return on assets	(591		)	(531		)
Prior service cost amortization	—			—
Loss amortization	189			158
Net periodic cost of defined pension benefit plans	$	89		$	192