Divestiture Related Activities (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
(Losses) gains on divestitures	$ 617,000	$ (8,526,000)	$ 16,547,000
Impairment losses	(2,150,000)	(2,451,000)	(8,035,000)
(Losses) gains on divestitures and impairment charges, net	(1,533,000)	(10,977,000)	8,512,000
Keystone [Member]
(Losses) gains on divestitures		6,200,000
Proceeds from Divestiture of Businesses		$ 34,900,000

The gain (loss) resulting from the sale of a disposal group that is not a discontinued operation. It is included in income from continuing operations before income taxes in the income statement.

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The loss (gain) resulting from the write-down of the carrying value of assets classified as a disposal group, but one which is not further classified as a discontinued operation, to fair value less cost to sell. A (gain) results from a subsequent increase in fair value less cost to sell, but not in excess of the cumulative loss previously recognized. For example, the write-down of a disposal group subject to a plan of sale, which was not sold in the current period, to its held-for-sale value. The loss (gain) is included in income from continuing operations before income taxes in the income statement.

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