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Retirement Benefits (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net periodic pension cost
Interest cost	$ 234	$ 250	$ 702	$ 750
Amortization of loss	45	22	135	66
Net periodic pension cost	$ 279	$ 272	$ 837	$ 816

- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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