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Investments in Non-Consolidated Subsidiaries Investments in Non-Consolidated Subsidiaries (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings from equity method investments	$ 7,483	$ 3,116	$ 39,689	$ 22,903
White Cliffs Pipeline L L C [Member]
Earnings from equity method investments	10,786	10,021	31,886	25,053
NGL Energy Partners LP [Member]
Earnings from equity method investments	(3,288)	(6,905)	7,828	(2,150)
Glass Mountain Pipeline Llc [Member]
Earnings from equity method investments	$ (15)	$ 0	$ (25)	$ 0

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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