Pension and Other Post-Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2013

Compensation and Retirement Disclosure [Abstract]

Combined amount of net periodic benefit cost recognized

The following table sets forth the combined amount of net periodic benefit cost recognized for the three months ended March 31, 2013 and 2012:

	Three Months Ended
	March 31,
	2013			2012
Components of net periodic pension benefit cost:
Service cost	$	639		$	568
Interest cost	1,186			1,147
Expected return on plan assets	(1,409		)	(1,227		)
Amortization of actuarial gains	261			251
Amortization of prior service costs	(65		)	(19		)
Net periodic cost	$	612		$	720