Retirement Benefit Plans

The Company maintains various defined benefit pension and postretirement health care plans that provide benefits based on years of service and average compensation during certain periods. The Company's policy is to make contributions to fund these plans within the range allowed by applicable regulations. Plan assets consist primarily of publicly traded stocks and government and corporate bonds.

Pension benefits are frozen for all employees other than certain NACoal unconsolidated mine employees (see Note 15 regarding subsequent events related to this plan). All other eligible employees of the Company, including employees whose pension benefits are frozen, receive retirement benefits under defined contribution retirement plans.

The components of pension and postretirement health care expense are set forth below:



	THREE MONTHS ENDED						SIX MONTHS ENDED
	JUNE 30						JUNE 30
	2013			2012			2013			2012
U.S. Pension and Postretirement Health Care
Service cost	$	18		$	19		$	38		$	39
Interest cost	686			769			1,466			1,646
Expected return on plan assets	(1,087		)	(1,055		)	(2,303		)	(2,235		)
Amortization of actuarial loss	651			773			1,252			1,453
Amortization of prior service credit	(55		)	(156		)	(100		)	(126		)
Total	$	213		$	350		$	353		$	777
Non-U.S. Pension
Service cost	$	—		$	—		$	—		$	—
Interest cost	51			51			101			103
Expected return on plan assets	(71		)	(71		)	(143		)	(142		)
Amortization of actuarial loss	31			33			61			65
Total	$	11		$	13		$	19		$	26