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Retirement Benefits (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net periodic pension cost for the Company's supplemental retirement program
Interest cost	$ 204	$ 234
Amortization of loss	77	45
Net periodic pension cost	$ 281	$ 279

- 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.

+ References+ Details