Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2013

Employee Benefit Plans

Schedule of net periodic (benefit) cost

	Three months ended September 30,
	Defined Benefit Pension Plan						Post-Retirement Medical Plan						Supplemental Executive Retirement Plan
	2013			2012			2013			2012			2013		2012
Components of net periodic cost (benefit):
Service cost	$	1,627		$	1,088		$	246		$	205		$	251	$	251
Interest cost	5,328			5,236			138			143			637		736
Expected return on plan assets	(6,317		)	(5,459		)	—			—			—		—
Amortization of unrecognized prior service cost (benefit)	13			12			(413		)	(413		)	233		235
Amortization of loss (gain) from earlier periods	4,212			3,086			(55		)	(114		)	325		184
Net periodic cost (benefit)	$	4,863		$	3,963		$	(84	)	$	(179	)	$	1,446	$	1,406

	Nine months ended September 30,
	Defined Benefit Pension Plan						Post-Retirement Medical Plan						Supplemental Executive Retirement Plan
	2013			2012			2013			2012			2013		2012
Components of net periodic cost (benefit):
Service cost	$	4,146		$	3,263		$	710		$	613		$	752	$	743
Interest cost	15,673			15,708			384			427			1,911		2,184
Expected return on plan assets	(18,375		)	(16,348		)	—			—			—		—
Amortization of unrecognized prior service cost (benefit)	38			38			(1,237		)	(1,238		)	699		700
Amortization of loss (gain) from earlier periods	12,001			7,456			(262		)	(341		)	975		478
Net periodic cost (benefit)	$	13,483		$	10,117		$	(405	)	$	(539	)	$	4,337	$	4,105

Schedule of contributions to the Defined Benefit Pension Plan and payments made to the Post-Retirement Medical Plan and the Supplemental Executive Retirement Plan

	Three months ended September 30,
	2013		2012
Contributions to the Defined Benefit Pension Plan	$	14,624	$	4,300
Payments to the Post-Retirement Medical Plan	109		109
Payments to the Supplemental Executive Retirement Plan	915		698

	Nine months ended September 30,
	2013		2012
Contributions to the Defined Benefit Pension Plan	$	16,649	$	17,600
Payments to the Post-Retirement Medical Plan	391		348
Payments to the Supplemental Executive Retirement Plan	2,775		2,094