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Consolidated Statements of Income and Comprehensive Income (parentheticals) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Comprehensive Income Parentheticals [Abstract]
Change in non-qualified employee benefit plan liability, tax	$ 1,161	$ 674	$ 1,273
Other Comprehensive Income Amortization of Defined Benefit Plan Net Prior Service Cost Recognized in Net Periodic Pension Cost Tax Portion	$ (383)	$ (257)	$ (58)

Tax effect on the accumulated change in the value of either the projected benefit obligation or plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost.

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