Pension Plans And Other Postretirement Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2011

Pension Plans And Other Postretirement Benefit Plans [Abstract]

Pension And Other Post Retirement Benefit Plans

	Pension Benefits						Other Post- retirement Benefits
	2011			2010			2011			2010
Three months ended September 30:
Service cost	$	3,303		$	2,878		$	433		$	219
Interest cost		6,017			5,823			1,005			631
Expected return on plan assets		(5,775	)		(5,347	)		(400	)		(341	)
Transition obligation recognition		—			—			125			126
Amortization of prior service cost		125			163			(37	)		(37	)
Net loss recognition		2,506			1,857			960			297
Net periodic benefit cost	$	6,176		$	5,374		$	2,086		$	895
Nine months ended September 30:
Service cost	$	9,548		$	8,634		$	1,299		$	640
Interest cost		18,143			17,469			3,015			1,881
Expected return on plan assets		(17,141	)		(16,041	)		(1,200	)		(1,023	)
Transition obligation recognition		—			—			375			378
Amortization of prior service cost		369			489			(111	)		(111	)
Net loss recognition		6,909			5,490			2,634			825
Net periodic benefit cost	$	17,828		$	16,041		$	6,012		$	2,590