Divestiture-Related Activities (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Divestiture-Related Activities [Abstract]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	$ 12,400	$ 26,889	$ 9,373	$ 64,753
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down	(1,636)	(319)	(5,970)	(6,001)
Gains on divestitures and impairment charges, net	$ 10,764	$ 26,570	$ 3,403	$ 58,752

Amount, before tax, of (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a disposal group. Excludes discontinued operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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