Risk Management (Notional Amounts and Terms of Company's Derivative Financial Instruments) (Details)	Mar. 31, 2014 bbl	Dec. 31, 2013 bbl
Propane Crude And Heating Oil [Member] | Fixed Price Payor
Derivative [Line Items]
Propane, crude and heating oil (barrels)	4,400,000	5,600,000
Propane Crude And Heating Oil [Member] | Fixed Price Receiver
Derivative [Line Items]
Propane, crude and heating oil (barrels)	4,500,000	6,800,000
Natural Gas [Member] | Fixed Price Payor
Derivative [Line Items]
Propane, crude and heating oil (barrels)	100,000	0
Natural Gas [Member] | Fixed Price Receiver
Derivative [Line Items]
Propane, crude and heating oil (barrels)	100,000	0