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Discontinued Operations (Details) (USD $)	3 Months Ended									12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Feb. 12, 2013
Discontinued Operations and Disposal Groups [Abstract]
Proceeds from Divestiture of Businesses	$ 31,000,000
Disposal Group, Including Discontinued Operation, Revenue										62,190,000	49,642,000	36,745,000
Disposal Group, Including Discontinued Operation, Operating Income (Loss)										7,172,000	4,316,000	(12,994,000)
Discontinued Operation, Tax Effect of Discontinued Operation										2,930,000	1,769,000	987,000
Income (loss) from discontinued operations, net of income taxes		1,574,000	847,000	1,485,000	336,000	865,000	924,000	415,000	343,000	4,242,000	2,547,000	(13,981,000)
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	14,400,000
Net Working Capital													$ 5,700,000

X

- Definition

The net value (measured at the lower of net carrying value or fair value less cost of disposal) for assets and liabilities of a disposal group, including a component of the entity (discontinued operation), to be sold or that has been disposed of through sale, as stipulated per the purchase agreement.

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Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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