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Consolidated Statements of Income (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements of Income [Abstract]
Tax effect on operating income	$ (6,000)	$ 177,000	$ 449,000
Tax effect on disposal and impairment		$ 217,000

Income tax expense or benefit attributable to Income or Loss from discontinued operations during the phase-out period.

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- Definition

Tax expense or benefit on the gain (loss), not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group.

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