Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2013

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Periodic Benefit Costs of Pension and Post-Retirement Healthcare

Components of the net periodic benefit cost related to the Company's qualified pension plans and post-retirement healthcare plans for the three and nine months ended September 30, 2013 and 2012 are presented below (in thousands):

	Three Months Ended September 30, 2013					Three Months Ended September 30, 2012
	Qualified Pension			Post- retirement Healthcare		Qualified Pension			Post- retirement Healthcare
Service cost	$	4,633		$	5,874	$	3,649		$	5,923
Interest cost	3,774			5,785		3,695			5,774
Expected return on plan assets	(3,082		)	—		(3,356		)	(8		)
Amortization of actuarial loss	1,635			1,464		575			1,398
Plan settlement	52			—		89			—
Net periodic benefit cost	$	7,012		$	13,123	$	4,652		$	13,087

	Nine Months Ended September 30, 2013					Nine Months Ended September 30, 2012
	Qualified Pension			Post- retirement Healthcare		Qualified Pension			Post- retirement Healthcare
Service cost	$	13,910		$	20,838	$	11,841		$	19,491
Interest cost	11,175			18,770		10,994			18,139
Expected return on plan assets	(9,384		)	—		(9,887		)	(25		)
Amortization of actuarial loss	3,981			5,934		1,617			4,762
Plan settlement	1,065			—		445			—
Net periodic benefit cost	$	20,747		$	45,542	$	15,010		$	42,367