Retirement Benefits (Tables)

9 Months Ended

Sep. 30, 2012

Retirement Benefits [Abstract]

Net periodic pension cost

	Three months ended September 30,				Nine months ended September 30,
	2012		2011		2012		2011
Interest cost	$	234	$	250	$	702	$	750
Amortization of loss		45		22		135		66
Net periodic pension cost	$	279	$	272	$	837	$	816