Defined Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2013

Net Periodic Cost (Benefit)

The components of the combined net periodic expense for the Corporation’s defined benefit pension plans were as follows:

	Three Months Ended March 31,
	2013			2012
Expected return on plan assets, net of expenses	$	(2,772	)	$	(2,603	)
Interest cost on projected benefit obligation		1,835			1,950
Net amortization and deferral		1,640			1,229
Net periodic expense	$	703		$	576