Acquisitions and Divestitures (Schedule of Components Of Property, Plant And Equipment Acquired) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2011 years
Property, plant, and equipment	$ 1,419,591	[1]
Land and improvements [Member]
Property, plant, and equipment	30,759
Buildings and improvements [Member]
Property, plant, and equipment	3,123
Property, plant and equipment, useful life, maximum (years)	40
Property, plant and equipment, useful life, minimum (years)	10
Pipelines And Equipment [Member]
Property, plant, and equipment	662,881
Property, plant and equipment, useful life, maximum (years)	65
Property, plant and equipment, useful life, minimum (years)	20
Natural Gas Liquid Storage [Member]
Property, plant, and equipment	682,419
Property, plant and equipment, useful life, maximum (years)	40
Linepack [Member]
Property, plant, and equipment	704
Vehicles [Member]
Property, plant, and equipment	242
Property, plant and equipment, useful life, maximum (years)	20
Property, plant and equipment, useful life, minimum (years)	3
Furniture and Fixtures [Member]
Property, plant, and equipment	49
Property, plant and equipment, useful life, maximum (years)	10
Property, plant and equipment, useful life, minimum (years)	3
Property, Plant and Equipment, Other Types [Member]
Property, plant, and equipment	8,526
Property, plant and equipment, useful life, maximum (years)	10
Property, plant and equipment, useful life, minimum (years)	5
Construction Work-In-Process [Member]
Property, plant, and equipment	$ 30,888

[1] Property, plant and equipment (and estimated useful lives) consists of the following:Land and improvements$30,759Buildings and improvements (10 to 40 years)3,123Pipelines and equipment (20 to 65 years)662,881Natural gas liquids storage (40 years)682,419Linepack704Vehicles (3 to 20 years)242Furniture and fixtures (3 to 10 years)49Other (5 to 10 years)8,526Construction work-in-process30,888Property, plant and equipment$1,419,591