Pension and Other Post-Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2012

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, 2012 and 2011:

	Three Months Ended
	March 31,
	2012			2011
Components of net periodic pension benefit cost:
Service cost	$	568		$	462
Interest cost	1,147			1,173
Expected return on plan assets	(1,227		)	(1,162		)
Amortization of actuarial gains	251			95
Amortization of prior service costs	(19		)	(3		)
Net periodic cost	$	720		$	565