Restructuring Restructuring Expected Costs, Costs To-Date, Remaining Costs, and Costs During the Period (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		15 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end	$ 75,469
Costs Recognized in Prior Periods			69,747
Costs recognized during the period ended	1,013	789
Remaining costs to be recognized at period end	4,709
Employee severance costs
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end	47,658
Costs Recognized in Prior Periods			44,196
Costs recognized during the period ended	84
Remaining costs to be recognized at period end	3,378
Asset impairments
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end	20,331
Costs Recognized in Prior Periods			20,305
Costs recognized during the period ended	26
Remaining costs to be recognized at period end	0
Other restructuring costs
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end	7,480
Costs Recognized in Prior Periods			5,246
Costs recognized during the period ended	903
Remaining costs to be recognized at period end	1,331
Energy [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end	52,930
Costs Recognized in Prior Periods			53,190
Costs recognized during the period ended	(1,150)
Remaining costs to be recognized at period end	890
Water [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end	16,042
Costs Recognized in Prior Periods			14,556
Costs recognized during the period ended	609
Remaining costs to be recognized at period end	877
Corporate Unallocated [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end	6,497
Costs Recognized in Prior Periods			2,001
Costs recognized during the period ended	1,554
Remaining costs to be recognized at period end	$ 2,942