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Derivatives and Risk Management Activities (Details) | Mar. 31, 2012 barrel
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Commodity Price Risk Hedging: |
Storage capacity owned but not used in entity's transportation operations (in barrels) | 78,000,000
Crude oil, LPG and refined products inventory hedged (in barrels) | 7,500,000
Net long crude oil derivative position |
Commodity Price Risk Hedging: |
Net derivative positions per day (in barrels) | 217,100
Crude oil, LPG and refined products inventory hedged (in barrels) | 6,500,000
Net short spread position hedging anticipated crude oil lease gathering purchases |
Commodity Price Risk Hedging: |
Net derivative positions per day (in barrels) | 21,400
Crude oil, LPG and refined products inventory hedged (in barrels) | 19,600,000
WTS/WTI crude oil basis swaps |
Commodity Price Risk Hedging: |
Net derivative positions per day (in barrels) | 9,000
Crude oil, LPG and refined products inventory hedged (in barrels) | 5,800,000
LLS/WTI crude oil basis swaps |
Commodity Price Risk Hedging: |
Net derivative positions per day (in barrels) | 10,500
Crude oil, LPG and refined products inventory hedged (in barrels) | 2,600,000
Average butane/WTI spread positions |
Commodity Price Risk Hedging: |
Net derivative positions per day (in barrels) | 16,200
Crude oil, LPG and refined products inventory hedged (in barrels) | 1,500,000
Crude oil net short position |
Commodity Price Risk Hedging: |
Net derivative positions per day (in barrels) | 1,500
Crude oil, LPG and refined products inventory hedged (in barrels) | 2,100,000
Crude oil long put option position |
Commodity Price Risk Hedging: |
Crude oil, LPG and refined products inventory hedged (in barrels) | 200,000
Crude oil long call option position |
Commodity Price Risk Hedging: |
Crude oil, LPG and refined products inventory hedged (in barrels) | 600,000
Long natural gas swaps position for anticipated base gas purchases |
Commodity Price Risk Hedging: |
Crude oil, LPG and refined products inventory hedged (in barrels) | 3.5
Short natural gas swap position related to anticipated natural gas sales |
Commodity Price Risk Hedging: |
Crude oil, LPG and refined products inventory hedged (in barrels) | 21.9

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- Definition Aggregate notional amount of price risk derivatives for instruments with notional amounts expressed in nonmonetary units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959 + Details
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