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Pension Plan Components Of Net Periodic Benefit Costs (Details) (Supplemental Employee Retirement Plans, Defined Benefit [Member], USD $) In Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2011
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 135	$ 135	$ 406	$ 404	$ 541
Net periodic pension cost	$ 135	$ 135	$ 406	$ 404	$ 541

- 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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