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Disposals and Impairments of Long-Lived Assets (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
SemStream Arizona Residential Propane Business [Member]
SemStream [Member]
Sep. 30, 2010
Crude [Member]
White Cliffs Pipeline, LLC [Member]
Dec. 31, 2012
SemStream [Member]
SemStream Arizona Residential Propane Business [Member]
Dec. 31, 2012
Loss (gain) on impairment or disposal of long-lived assets, net [Member]
Crude [Member]
White Cliffs Pipeline, LLC [Member]
Gain (loss) on deconsolidation, pre-tax         $ (6,800)   $ 3,500 [1]
Property, plant and equipment       9,400      
Cash proceeds from divestiture 0 12,250 93,054     12,300  
Gain (loss) on disposal of discontinued operation, pre-tax           $ 3,090 [2]  
[1] We sold a portion of our ownership interest in White Cliffs during September 2010. At the time, we recorded a loss of $6.8 million on disposal of that asset. In September 2012, we reached a settlement in a dispute concerning the selling price of that ownership interest and reduced the loss by $3.5 million. This $3.5 million gain is reported in "gain on disposal or impairment of long-lived assets, net" in the consolidated statements of operations and comprehensive income (loss).
[2] On September 12, 2012, we entered into a definitive agreement to sell the assets and liabilities of SemStream’s Arizona residential business which was subject to regulatory approval by the Arizona Corporation Commission (the "ACC"). In early December 2012, the ACC granted SemStream regulatory approval to proceed with the sale. The sale closed on December 31, 2012 and resulted in a gain of $3.1 million on a cash sales price of $12.3 million. The $3.1 million gain is reported in "income from discontinued operations, net of income taxes" in the consolidated statement of operations and comprehensive income (loss). Property, plant, and equipment with a carrying value of $9.4 million represented the majority of assets included in the sale.