Retirement and Postretirement Benefits other than Pension Plans (Tables)

9 Months Ended

Sep. 30, 2011

Retirement and Postretirement Benefits other than Pension Plans (Tables) [Abstract]

Defined Benefit Plan, Net Periodic Benefit Cost

	Three months ended						Nine months ended
	September 30,						September 30,
	2011			2010			2011			2010
Interest cost	$	1,208		$	1,309		$	3,625		$	3,685
Expected return on plan assets		(1,333	)		(1,245	)		(4,000	)		(3,639	)
Amortization of net actuarial loss		619			894			1,857			1,932
Total net periodic pension expense	$	494		$	958		$	1,482		$	1,978

	Three months ended						Nine months ended
	September 30,						September 30,
	2011			2010			2011			2010
Service cost	$	14		$	17		$	43		$	51
Interest cost		257			244			772			731
Amortization of net gain		—			(4	)		—			(10	)
Amortization of curtailment gain		(61	)		(61	)		(183	)		(183	)
Total net postretirement benefit expense	$	210		$	196		$	632		$	589