Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 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 months ended March 31, 2014 and 2013 are as follows (in thousands):

	Three Months Ended March 31, 2014					Three Months Ended March 31, 2013
	Qualified Pension			Post- retirement Healthcare		Qualified Pension			Post- retirement Healthcare
Service cost	$	4,075		$	6,344	$	4,638		$	7,482
Interest cost	3,963			7,311		3,697			6,493
Expected return on plan assets	(3,406		)	—		(3,170		)	—
Amortization of actuarial loss	539			924		1,156			2,235
Net periodic benefit cost	$	5,171		$	14,579	$	6,321		$	16,210