POSTRETIREMENT MEDICAL BENEFITS AND PENSION (Tables)

3 Months Ended

Mar. 31, 2013

Pension

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Components of net periodic benefit cost

The Company incurred net periodic benefit costs of providing these pension benefits as follows:

	Three Months Ended March 31,
	2013			2012
	(In thousands)
Components of net periodic benefit cost:
Service cost	$	534		$	440
Interest cost	1,625			1,448
Expected return on plan assets	(2,060		)	(1,905		)
Amortization of deferred items	741			729
Total net periodic pension cost	$	840		$	712

Postretirement Medical Benefits

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Components of net periodic benefit cost

The components of net periodic postretirement medical benefit cost are as follows:

	Three Months Ended March 31,
	2013		2012
	(In thousands)
Components of net periodic benefit cost:
Service cost	$	1,109	$	652
Interest cost	3,035		2,985
Amortization of deferred items	1,001		643
Total net periodic benefit cost	$	5,145	$	4,280

The following table shows the net periodic postretirement medical benefit costs that relate to current and former mining operations:

	Three Months Ended March 31,
	2013		2012
	(In thousands)
Former mining operations	$	3,119	$	2,829
Current operations	2,026		1,451
Total net periodic benefit cost	$	5,145	$	4,280