Restructuring Restructuring Expected Costs, Costs To-Date, Remaining Costs, and Costs During the Period (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end	$ 85,491
Costs recognized in prior periods	68,082
Costs recognized during the period ended	789	0
Remaining costs to be recognized at period end	16,620
Employee severance costs [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end	52,031
Costs recognized in prior periods	42,530
Costs recognized during the period ended	539
Remaining costs to be recognized at period end	8,962
Asset impairments [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end	25,547
Costs recognized in prior periods	25,144
Costs recognized during the period ended	0
Remaining costs to be recognized at period end	403
Other restructuring costs [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end	7,913
Costs recognized in prior periods	408
Costs recognized during the period ended	250
Remaining costs to be recognized at period end	7,255
Energy [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end	62,603
Costs recognized in prior periods	51,873
Costs recognized during the period ended	603
Remaining costs to be recognized at period end	10,127
Water [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end	17,491
Costs recognized in prior periods	15,321
Costs recognized during the period ended	18
Remaining costs to be recognized at period end	2,152
Corporate Unallocated [Member]
Restructuring Cost and Reserve [Line Items]
Total expected costs at period end	5,397
Costs recognized in prior periods	888
Costs recognized during the period ended	168
Remaining costs to be recognized at period end	$ 4,341