Pension Plan and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2013

Pension Plan and Other Postretirement Benefits

Components of net periodic benefit costs for the pension and other postretirement plans

	Three months Ended September 30
	Pension Plan						Other Benefits
	2013			2012			2013			2012
Service cost	$	4,019		$	3,863		$	1,636		$	1,374
Interest cost	4,140			3,822			1,121			986
Expected return on plan assets	(3,559		)	(2,890		)	(600		)	(458		)
Recognized net initial APBO (1)	N/A			N/A			3			69
Amortization of prior service cost	1,542			1,571			21			29
Recognized net actuarial loss	2,404			2,000			961			793
Net periodic benefit cost	$	8,546		$	8,366		$	3,142		$	2,793

	Nine months Ended September 30
	Pension Plan						Other Benefits
	2013			2012			2013			2012
Service cost	$	13,335		$	11,588		$	5,025		$	4,121
Interest cost	12,266			11,465			3,339			2,958
Expected return on plan assets	(10,689		)	(8,669		)	(1,796		)	(1,374		)
Recognized net initial APBO (1)	N/A			N/A			7			207
Amortization of prior service cost	4,624			4,712			61			87
Recognized net actuarial loss	6,852			6,001			2,794			2,379
Net periodic benefit cost	$	26,388		$	25,097		$	9,430		$	8,378

(1) APBO - Accumulated postretirement benefit obligation