Derivatives (Details Textuals) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Derivative [Line Items]
Maximum counterparty loss	$ 0.9
Maximum counterparty loss with netting feature	0.7
Cash Flow Liquid Swap [Member]
Derivative [Line Items]
Unrealized Gain (Loss) on Price Risk Cash Flow Derivatives, before Tax	0.1
Price Risk Cash Flow Hedge Unrealized Gain (Loss) to be Reclassified During Next 12 Months	$ 0.1