Pension Plans And Other Postretirement Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2013

Components of Net Periodic Benefit Cost

	Pension Benefits						Other Post-retirement Benefits
	2013			2012			2013			2012
Three months ended September 30:
Service cost	$	4,743		$	3,891		$	971		$	689
Interest cost	5,978			6,084			1,373			1,256
Expected return on plan assets	(6,900		)	(5,950		)	(402		)	(375		)
Transition obligation recognition	—			—			—			125
Amortization of prior service cost	75			75			(37		)	(37		)
Net loss recognition	3,220			3,019			1,395			1,250
Net periodic benefit cost	$	7,116		$	7,119		$	3,300		$	2,908
Nine months ended September 30:
Service cost	$	14,229		$	11,573		$	3,035		$	2,067
Interest cost	17,934			18,277			4,153			3,793
Expected return on plan assets	(20,700		)	(17,900		)	(1,202		)	(1,125		)
Transition obligation recognition	—			—			—			375
Amortization of prior service cost	225			225			(111		)	(111		)
Net loss recognition	9,989			8,797			4,342			3,814
Net periodic benefit cost	$	21,677		$	20,972		$	10,217		$	8,813