Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Enogex Federal Court Case [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	$ 75,000
Enogex State Court Case [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	$ 105,000