M. Pension and Other Postretirement Benefits – The components of net periodic benefit cost were as follows:


	Second quarter ended June 30,						Six months ended June 30,
Pension benefits	2012			2011			2012			2011
Service cost	$	46		$	41		$	93		$	82
Interest cost		160			171			320			340
Expected return on plan assets		(201	)		(202	)		(403	)		(403	)
Amortization of prior service cost		4			4			9			9
Recognized net actuarial loss		95			62			191			124

Net periodic benefit cost	$	104		$	76		$	210		$	152


	Second quarter ended June 30,						Six months ended June 30,
Other postretirement benefits	2012			2011			2012			2011
Service cost	$	3		$	4		$	7		$	8
Interest cost		33			39			66			79
Expected return on plan assets		—			—			—			(1	)
Amortization of prior service benefit		(4	)		(4	)		(8	)		(8	)
Recognized net actuarial loss		6			6			12			13

Net periodic benefit cost	$	38		$	45		$	77		$	91