Derivative Instruments And Hedging Activities Volumes related to price risk purchase derivatives (Details)	Sep. 30, 2014 MMBTU
Natural Gas - long [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Cash Flow Hedges against Price Risk for Future Purchases	31,200,000
WTI Crude Oil [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Volume related to price risk derivative for future purchases	11,418,000
Ultra Low Sulfur Diesel [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Volume related to price risk derivative for future purchases	8,106,000
Produced Gasoline Member
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Volume related to price risk derivative for future purchases	3,312,000
Maturing in Next Twelve Months [Member] | Natural Gas - long [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Cash Flow Hedges against Price Risk for Future Purchases	2,400,000
Maturing in Next Twelve Months [Member] | WTI Crude Oil [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Volume related to price risk derivative for future purchases	7,038,000
Maturing in Next Twelve Months [Member] | Ultra Low Sulfur Diesel [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Volume related to price risk derivative for future purchases	3,726,000
Maturing in Next Twelve Months [Member] | Produced Gasoline Member
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Volume related to price risk derivative for future purchases	3,312,000
Maturing in Year Two [Member] | Natural Gas - long [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Cash Flow Hedges against Price Risk for Future Purchases	9,600,000
Maturing in Year Two [Member] | WTI Crude Oil [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Volume related to price risk derivative for future purchases	4,380,000
Maturing in Year Two [Member] | Ultra Low Sulfur Diesel [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Volume related to price risk derivative for future purchases	4,380,000
Maturing in Year Three [Member] | Natural Gas - long [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Cash Flow Hedges against Price Risk for Future Purchases	9,600,000
Maturing in Year Four [Member] | Natural Gas - long [Member]
Price Risk Derivatives for Future Purchases Notional Contract Volumes [Line Items]
Cash Flow Hedges against Price Risk for Future Purchases	9,600,000