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Contingencies (Details) - Jun. 30, 2015 - USD ($)
$ in Thousands
Total
Loss Contingencies [Line Items]  
Restructuring Costs $ 1,300
Enogex Federal Court Case [Member]  
Loss Contingencies [Line Items]  
Loss Contingency, Damages Sought, Value 67,500
Enogex State Court Case [Member]  
Loss Contingencies [Line Items]  
Loss Contingency, Damages Sought, Value 75,000
Facility Closing [Member]  
Loss Contingencies [Line Items]  
Restructuring and Related Cost, Expected Cost Remaining 2,000
Other Restructuring [Member]  
Loss Contingencies [Line Items]  
Restructuring and Related Cost, Expected Cost Remaining $ 1,000