Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2014

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, 2014 and 2013 are as follows (in thousands):

	Three Months Ended September 30, 2014					Three Months Ended September 30, 2013
	Qualified Pension			Post- retirement Healthcare		Qualified Pension			Post- retirement Healthcare
Service cost	$	3,514		$	6,279	$	4,633		$	5,874
Interest cost	3,862			7,897		3,774			5,785
Expected return on plan assets	(3,368		)	—		(3,082		)	—
Amortization of actuarial loss	556			1,729		1,635			1,464
Plan settlement	650			—		52			—
Net periodic benefit cost	$	5,214		$	15,905	$	7,012		$	13,123
	Nine Months Ended September 30, 2014					Nine Months Ended September 30, 2013
	Qualified Pension			Post- retirement Healthcare		Qualified Pension			Post- retirement Healthcare
Service cost	$	11,664		18,968		$	13,910		$	20,838
Interest cost	11,788			22,520		11,175			18,770
Expected return on plan assets	(10,179		)	—		(9,384		)	—
Amortization of actuarial loss	1,634			3,576		3,981			5,934
Plan settlement	650			—		1,065			—
Net periodic benefit cost	$	15,557		$	45,064	$	20,747		$	45,542