Retirement Benefit Plans

3 Months Ended

Mar. 31, 2013

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Retirement Benefit Plans

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. 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 care are set forth below:

	THREE MONTHS ENDED
	MARCH 31
	2013			2012
U.S. Pension and Postretirement Health Care
Service cost	$	20		$	20
Interest cost	780			877
Expected return on plan assets	(1,216		)	(1,180		)
Amortization of actuarial loss	601			680
Amortization of prior service credit	(45		)	30
Total	$	140		$	427
Non-U.S. Pension
Service cost	$	—		$	—
Interest cost	50			52
Expected return on plan assets	(72		)	(71		)
Amortization of actuarial loss	30			32
Total	$	8		$	13