Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2016

Retirement Plans

Defined Benefit Plan Disclosure [Line Items]

Benefit costs

Our pension costs, which include costs for qualified and nonqualified plans, are presented in the following table (in thousands):

	Quarters Ended
	Mar. 31, 2016			Mar. 29, 2015
Service cost-benefits earned during the period	$	250		$	233
Interest cost on benefit obligation	6,350			5,652
Expected return on plan assets (a)	(6,750		)	(7,497		)
Amortization of prior service cost	150			148
Amortization of actuarial loss	1,700			1,468
Expense for company-sponsored retirement plans	$	1,700		$	4

(a) At the beginning of 2016, we updated our expected annual long-term rate of return on our TRP plan assets to 7.0% from 8.0%. This change resulted in incremental pension costs of approximately $1.4 million in the first quarter of 2016, and will result in approximately $5.5 million of incremental pension costs for the full year 2016.