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Quarterly Information (Unaudited) Quarterly Financial Information (Unaudited) (Narrative) (Details) (USD $)	12 Months Ended						3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Globetec [Member]	Dec. 31, 2011 Globetec [Member]	Dec. 31, 2010 Globetec [Member]	Jun. 30, 2011 Ec Source [Member]	Dec. 31, 2012 Pending Litigation [Member] Sintel [Member]	Dec. 31, 2012 Multiemployer Plans, Pension [Member] Central States Southeast And Southwest Areas Pension Fund [Member]
Impairment of assets, disposal group	$ 12,922,000	$ 0	$ 0	$ 12,700,000	$ 0	$ 0
Pending or threatened litigation, estimated loss								9,600,000
Gain on remeasurement of equity interest in acquiree	0	29,041,000	0				29,000,000
Multiemployer plans, withdrawal liability	$ 6,400,000								$ 6,400,000

Pretax provision recognizing a loss for initial, or subsequent, write-down to fair value (less cost to sell) of a disposal group that is classified as a component of the entity, which remains unsold as of the reporting date. May include the recognition of a pretax (gain) for a subsequent increase in fair value (less cost to sell), but not in excess of the cumulative loss previously recognized through write-downs.

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