Restructuring Restructuring Expected Costs, Cost Recognized, and Remaining Costs to be Recognized (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]
Total Expected Cost	$ 77,834,000
Restructuring costs recognized in prior periods		68,082,000
Cost Recognized	1,665,000	68,082,000	0
Restructuring Costs to be Recognized	8,087,000
Change in Total Expected Restructuring Costs	7,700,000
Energy Operating Segment [Member]
Restructuring Cost and Reserve [Line Items]
Total Expected Cost	55,987,000
Restructuring costs recognized in prior periods		51,873,000
Cost Recognized	1,317,000
Restructuring Costs to be Recognized	2,797,000
Water Operating Segment [Member]
Restructuring Cost and Reserve [Line Items]
Total Expected Cost	16,127,000
Restructuring costs recognized in prior periods		15,321,000
Cost Recognized	(765,000)
Restructuring Costs to be Recognized	1,571,000
Unallocated Amount to Segment [Member]
Restructuring Cost and Reserve [Line Items]
Total Expected Cost	5,720,000
Restructuring costs recognized in prior periods		888,000
Cost Recognized	1,113,000
Restructuring Costs to be Recognized	3,719,000
Employee severance costs
Restructuring Cost and Reserve [Line Items]
Total Expected Cost	47,891,000
Restructuring costs recognized in prior periods		42,530,000
Cost Recognized	1,666,000
Restructuring Costs to be Recognized	3,695,000
Asset impairments
Restructuring Cost and Reserve [Line Items]
Total Expected Cost	21,351,000
Restructuring costs recognized in prior periods		25,144,000
Cost Recognized	(4,839,000)
Restructuring Costs to be Recognized	1,046,000
Other restructuring costs
Restructuring Cost and Reserve [Line Items]
Total Expected Cost	8,592,000
Restructuring costs recognized in prior periods		408,000
Cost Recognized	4,838,000
Restructuring Costs to be Recognized	$ 3,346,000