Investments In Non-Consolidated Subsidiaries (Balance Sheet Disclosure) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012 White Cliffs Pipeline, LLC [Member]	Dec. 31, 2011 White Cliffs Pipeline, LLC [Member]	Sep. 30, 2012 Ngl Energy Partners Lp [Member]
Current assets	$ 21,508	$ 11,653	$ 736,297
Property, plant and equipment, net	210,710	222,473	425,641
Goodwill	17,000	17,000	515,881
Other intangible assets, net	26,369	33,073	351,600
Total assets	275,587	284,199	2,029,419
Current liabilities	3,412	3,259	653,101
Long-term debt			569,903
Other noncurrent liabilities			2,599
Members’ equity	272,175	280,940	803,816
Total liabilities and members’ equity	$ 275,587	$ 284,199	$ 2,029,419