EMPLOYEE BENEFIT PLANS

The Company has four qualified non-contributory defined benefit pension plans covering a significant majority of its employees and an unfunded plan that provides benefits in excess of amounts allowable under current tax law in the qualified plans. Currently, all qualified plans are closed to new participants. Employee benefit plan liabilities are calculated using actuarial estimates and management assumptions. These estimates are based on historical information, along with certain assumptions about future events. Changes in assumptions, as well as changes in actual experience, could cause the estimates to change.

The net pension and postretirement benefit costs that have been recorded are shown in the following tables:



	Pension						Postretirement
	Three Months Ended September 30,						Three Months Ended September 30,
	2013			2012			2013		2012
Components of Net Periodic Benefit Cost
Service cost	$	2,011		$	2,102		$	330	$	227
Interest cost	3,953			4,321			231		242
Expected return on plan assets	(5,966		)	(6,369		)	—		—
Amortization of prior service cost	322			327			6		6
Amortization of losses	4,792			4,394			98		156
Net periodic benefit cost	$	5,112		$	4,775		$	665	$	631



	Pension						Postretirement
	Nine Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013		2012
Components of Net Periodic Benefit Cost
Service cost	$	6,441		$	6,143		$	828	$	664
Interest cost	12,740			12,630			711		706
Expected return on plan assets	(19,356		)	(18,618		)	—		—
Amortization of prior service cost	1,032			956			19		18
Amortization of losses	15,308			12,846			533		455
Net periodic benefit cost	$	16,165		$	13,957		$	2,091	$	1,843

In 2013, the Company has no mandatory pension contribution requirements and does not expect to make any discretionary contributions.