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Restructuring Expected Costs - 2016 Projects (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]          
Restructuring $ (678) $ 40,679 $ 7,417 $ 41,294  
2016 Projects [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost 63,211   63,211    
Restructuring and Related Cost, Cost Incurred to Date         $ 47,794
Restructuring     7,417    
Remaining Costs to be Recognized at Period End 8,000   8,000    
Employee Severance [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring     4,832    
Employee Severance [Member] | 2016 Projects [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost 44,518   44,518    
Restructuring and Related Cost, Cost Incurred to Date         39,686
Restructuring     4,832    
Remaining Costs to be Recognized at Period End 0   0    
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring     (720)    
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member] | 2016 Projects [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost 6,499   6,499    
Restructuring and Related Cost, Cost Incurred to Date         7,219
Restructuring     (720)    
Remaining Costs to be Recognized at Period End 0   0    
Other restructuring costs          
Restructuring Cost and Reserve [Line Items]          
Restructuring     3,305    
Other restructuring costs | 2016 Projects [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost 12,194   12,194    
Restructuring and Related Cost, Cost Incurred to Date         889
Restructuring     3,305    
Remaining Costs to be Recognized at Period End 8,000   8,000    
Electricity Operating Segment [Member] | 2016 Projects [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost 11,884   11,884    
Restructuring and Related Cost, Cost Incurred to Date         8,827
Restructuring     1,557    
Remaining Costs to be Recognized at Period End 1,500   1,500    
Gas Operating Segment [Member] | 2016 Projects [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost 32,185   32,185    
Restructuring and Related Cost, Cost Incurred to Date         23,968
Restructuring     4,717    
Remaining Costs to be Recognized at Period End 3,500   3,500    
Water Operating Segment [Member] | 2016 Projects [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost 16,007   16,007    
Restructuring and Related Cost, Cost Incurred to Date         13,061
Restructuring     446    
Remaining Costs to be Recognized at Period End 2,500   2,500    
Corporate, Non-Segment [Member] | 2016 Projects [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring and Related Cost, Expected Cost 3,135   3,135    
Restructuring and Related Cost, Cost Incurred to Date         $ 1,938
Restructuring     697    
Remaining Costs to be Recognized at Period End $ 500   $ 500