EMPLOYEE BENEFIT PLANS

Components of net pension expense were as follows:



	Three months ended June 30,					Six months ended June 30,
	2017			2016		2017			2016
	(In thousands)
Pension Benefits
Company-administered plans:
Service cost	$	3,017		3,005		$	6,266		6,405
Interest cost	21,426			27,093		42,915			49,332
Expected return on plan assets	(22,712		)	(22,667	)	(45,190		)	(45,752	)
Amortization of:
Net actuarial loss	8,077			8,600		16,527			16,565
Prior service cost	121			2,740		266			2,740
	9,929			18,771		20,784			29,290
Union-administered plans	2,621			2,406		5,123			4,728
Net pension expense	$	12,550		21,177		$	25,907		34,018

Company-administered plans:
U.S.	$	10,547		19,263		$	21,858		30,437
Non-U.S.	(618		)	(492	)	(1,074		)	(1,147	)
	9,929			18,771		20,784			29,290
Union-administered plans	2,621			2,406		5,123			4,728
Net pension expense	$	12,550		21,177		$	25,907		34,018

During the six months ended June 30, 2017, we contributed $7.2 million to our pension plans. In 2017, the expected total contributions to our pension plans are approximately $23 million. We also maintain other postretirement benefit plans that are not reflected in the above table. The amount of postretirement benefit expense was not material for the three or six months ended June 30, 2017.

During the second quarter of 2016, we determined that certain pension benefit improvements made in 2009 had not been fully reflected in our projected benefit obligation. Because the amounts were not material to our consolidated financial statements in any individual period, and the cumulative amount was not material to 2016 results, we recognized a one-time, non-cash charge of $7.7 million in "Selling, general and administrative expenses" and a $12.8 million pre-tax increase to “Accumulated other comprehensive loss” in our second quarter 2016 consolidated condensed financial statements to correctly state the pension benefit obligation and account for these 2009 benefit improvements.