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Derivatives and Hedging Instruments (Details)	Dec. 31, 2011 barrel
Commodity Price Risk Hedging:
Total derivative positions	5,000,000
Storage capacity owned but not used in entity's transportation operations (in barrels)	80,000,000
Derivative hedges to manage the risk of not utilizing storage capacity (in barrels)	3,700,000
Net long crude oil derivative position
Commodity Price Risk Hedging:
Net derivative positions per day (in barrels)	177,300
Total derivative positions	5,300,000
Net short spread position hedging anticipated crude oil lease gathering purchases
Commodity Price Risk Hedging:
Net derivative positions per day (in barrels)	30,800
Total derivative positions	10,300,000
WTS/WTI crude oil basis swaps
Commodity Price Risk Hedging:
Net derivative positions per day (in barrels)	9,200
Total derivative positions	6,700,000
LLS/WTI crude oil basis swaps
Commodity Price Risk Hedging:
Net derivative positions per day (in barrels)	6,000
Total derivative positions	2,200,000
Crude oil net short position
Commodity Price Risk Hedging:
Net derivative positions per day (in barrels)	1,500
Total derivative positions	2,200,000
Crude oil long put option position
Commodity Price Risk Hedging:
Total derivative positions	400,000
Crude oil long call option position
Commodity Price Risk Hedging:
Total derivative positions	900,000
Long natural gas swaps position for anticipated base gas purchases
Commodity Price Risk Hedging:
Total derivative positions	3.0
Short natural gas swap position related to anticipated natural gas sales
Commodity Price Risk Hedging:
Total derivative positions	14.6
Long natural gas swap position related to anticipated natural gas purchases
Commodity Price Risk Hedging:
Total derivative positions	0.6