Pension and Other Post-Retirement Plans (Tables)

9 Months Ended

Sep. 30, 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 and nine months ended September 30, 2012 and 2011:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2012			2011			2012			2011
Components of net periodic pension benefit cost:
Service cost	$	428		$	589		$	1,564		$	1,512
Interest cost	1,135			1,114			3,429			3,461
Expected return on plan assets	(1,436		)	(1,161		)	(3,890		)	(3,485		)
Amortization of actuarial gains	135			95			637			284
Amortization of prior service costs	(113		)	(54		)	(151		)	(59		)
Net periodic cost	$	149		$	583		$	1,589		$	1,713