(13) PENSION PLAN AND OTHER POSTRETIREMENT BENEFITS

The Company has defined pension and postretirement benefit plans which cover substantially all of the Company’s employees. Net periodic pension and other postretirement benefit costs include the following components for the three month periods ended March 31, 2014 and 2013:


	Pension Benefits
	For the three months ended
	March 31,
	2014		2013
	(in thousands)

Service cost	$	3,323	$	3,447
Interest cost		1,284		1,026
Expected return on plan assets		(1,788)		(1,534)
Amortization of prior service cost		26		26
Amortization of net loss		89		385
Net periodic benefit cost	$	2,934	$	3,350

	Postretirement Benefits
	For the three months ended
	March 31,
	2014		2013
	(in thousands)

Service cost	$	619	$	574
Interest cost		160		110
Amortization of prior service cost		4		4
Amortization of net loss		16		30
Net periodic benefit cost	$	799	$	718

As of March 31, 2014, the Company has contributed $3.0 million to the pension plan, and expects to contribute an additional $9.0 million to the pension plan in 2014.

The Company maintains a non-qualified deferred compensation supplemental retirement savings plan (“Non-Qualified Plan”) for certain key employees who may elect to defer and contribute a portion of their compensation, as permitted by the plan. Shares of the Company’s common stock purchased under the terms of the Non-Qualified Plan are presented as treasury stock and totaled 10,608 shares at March 31, 2014 compared to 9,924 shares at December 31, 2013.