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Retirement Benefits (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net periodic pension cost for the Company's supplemental retirement program
Interest cost	$ 935	$ 1,001	$ 1,017
Amortization of loss	182	86	39
Net periodic pension cost	$ 1,117	$ 1,087	$ 1,056

- 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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