BENEFIT PLANS

We sponsor several defined benefit pension plans. Additionally, we provide varying levels of postretirement health care and life insurance benefits to some U.S. employees.

During the quarter we recognized a special termination benefit charge of $0.5 million and a curtailment loss of $0.4 million for one of our U.S.-based defined benefit pension plans resulting from a plant closure. The special termination benefit charge was recognized in restructuring expense.

The table below summarizes the components of net periodic pension income:



	Three Months Ended December 31,						Six Months Ended December 31,
(in thousands)	2014			2013			2014			2013
Service cost	$	1,384		$	1,732		$	2,799		$	3,448
Interest cost	9,745			10,308			19,681			20,484
Expected return on plan assets	(14,900		)	(14,916		)	(29,947		)	(29,712		)
Amortization of transition obligation	19			20			40			38
Amortization of prior service credit	(71		)	(58		)	(141		)	(117		)
Recognition of actuarial losses	937			670			1,937			1,312
Curtailment loss	358			—			358			—
Special termination benefit charge	459			—			459			—
Net periodic pension income	$	(2,069	)	$	(2,244	)	$	(4,814	)	$	(4,547	)

The table below summarizes the components of the net periodic other postretirement benefit cost:



	Three Months Ended December 31,						Six Months Ended December 31,
(in thousands)	2014			2013			2014			2013
Service cost	$	27		$	14		$	54		$	28
Interest cost	259			251			519			502
Amortization of prior service credit	(28		)	(28		)	(55		)	(56		)
Recognition of actuarial loss	207			79			414			158
Curtailment gain	(221		)	—			(221		)	—
Net periodic other postretirement benefit cost	$	244		$	316		$	711		$	632

The curtailment gain of $0.2 million was a result of the plant closure discussed above.