Retirement and Postretirement Benefits other than Pension Plans (Tables)

6 Months Ended

Jun. 30, 2011

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

Defined Benefit Plan, Net Periodic Benefit Cost

	Three months ended						Six months ended
	June 30,						June 30,
	2011			2010			2011			2010
Interest cost	$	1,209		$	1,188		$	2,417		$	2,376
Expected return on plan assets		(1,334	)		(1,197	)		(2,667	)		(2,394	)
Amortization of net actuarial loss		619			519			1,238			1,038
Total net periodic pension expense	$	494		$	510		$	988		$	1,020

	Three months ended						Six months ended
	June 30,						June 30,
	2011			2010			2011			2010
Service cost	$	15		$	17		$	29		$	34
Interest cost		257			243			515			487
Amortization of net gain		—			(3	)		—			(6	)
Amortization of curtailment gain		(61	)		(61	)		(122	)		(122	)
Total net postretirement benefit expense	$	211		$	196		$	422		$	393