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Retirement Benefits (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net periodic pension cost
Interest cost	$ 234	$ 250	$ 468	$ 500
Amortization of loss	45	22	90	44
Net periodic pension cost	$ 279	$ 272	$ 558	$ 544

- 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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