Pension Plan and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2011

Pension Plan and Other Postretirement Benefits

Components of the pension plans and other postretirement benefits

	Three Months Ended June 30												Six Months Ended June 30
	Pension Plan						Other Benefits						Pension Plan						Other Benefits
	2011			2010			2011			2010			2011			2010			2011			2010
Service cost	$	2,716		$	2,451		$	1,002		$	793		$	5,857		$	4,902		$	1,981		$	1,586
Interest cost	3,600			3,332			955			783			7,342			6,664			1,788			1,566
Expected return on plan assets	(2,231		)	(2,051		)	(347		)	(279		)	(4,475		)	(4,102		)	(688		)	(558		)
Recognized net initial APBO (1)	N/A			N/A			69			69			N/A			N/A			138			138
Amortization of prior service cost	1,579			1,649			29			29			3,159			3,298			58			58
Recognized net actuarial loss	955			524			583			392			2,034			1,048			1,008			784
Net periodic benefit cost	$	6,619		$	5,905		$	2,291		$	1,787		$	13,917		$	11,810		$	4,285		$	3,574

(1)APBO — Accumulated postretirement benefit obligation