Postretirement Medical Plan

3 Months Ended

Mar. 31, 2015

Postretirement Medical Plan

Pension and Other Postretirement Benefits Disclosure [Text Block]

13. Postretirement Medical Plan

We maintain an unfunded postretirement medical plan to provide certain postretirement medical benefits to eligible employees. Net periodic postretirement benefit costs included the following components (in thousands):

		Three Months Ended
		March 31,
		2015		2014
Service cost		$	1,229	$	1,038
Interest cost			482		464
Amortization of prior service cost			313		247
	Net periodic benefit cost	$	2,024	$	1,749