Employee Benefits (Tables)

3 Months Ended

Mar. 31, 2012

Other Postretirement Benefit Plans, Defined Benefit

Defined Benefit Plan Disclosure [Line Items]

Schedule Of Net Periodic Benefit Cost

The net periodic benefit cost recognized for the three and twelve months ended March 31, 2012 and 2011 is made up of the components listed below (in thousands):

	Three Months Ended						Twelve Months Ended
	March 31,						March 31,
	2012			2011			2012			2011
Components of net periodic benefit cost:
Service cost	$	1,070		$	738		$	3,320		$	3,371
Interest cost	1,415			1,290			5,504			6,229
Expected return on plan assets	(435		)	(458		)	(1,800		)	(1,612		)
Amortization of:
Prior service benefit	(1,470		)	(1,482		)	(5,915		)	(3,626		)
Net loss (gain)	160			(108		)	229			(283		)
Net periodic benefit cost	$	740		$	(20	)	$	1,338		$	4,079

Retirement Income Plan

Defined Benefit Plan Disclosure [Line Items]

Schedule Of Net Periodic Benefit Cost

The net periodic benefit cost recognized for the three and twelve months ended March 31, 2012 and 2011 is made up of the components listed below as determined using the projected unit credit actuarial cost method (in thousands):

	Three Months Ended						Twelve Months Ended
	March 31,						March 31,
	2012			2011			2012			2011
Components of net periodic benefit cost:
Service cost	$	2,225		$	1,743		$	7,332		$	6,307
Interest cost	3,378			3,495			13,870			13,699
Amendments	—			—			—			838
Expected return on plan assets	(3,610		)	(3,533		)	(14,172		)	(13,900		)
Amortization of:
Net loss	2,965			1,583			7,926			4,232
Prior service cost	27			27			115			117
Net periodic benefit cost	$	4,985		$	3,315		$	15,071		$	11,293