Investments in Non-Consolidated Subsidiaries (Details Textual) (USD $)	3 Months Ended								12 Months Ended				12 Months Ended					12 Months Ended						3 Months Ended	12 Months Ended										12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 White Cliffs Pipeline, LLC [Member]	Dec. 31, 2012 White Cliffs Pipeline, LLC [Member]	Dec. 31, 2011 White Cliffs Pipeline, LLC [Member]	Dec. 31, 2013 Ngl Energy Partners Lp [Member]	Dec. 31, 2013 Glass Mountain Pipeline LLC [Member]	Dec. 31, 2013 SemStream [Member]	Dec. 31, 2012 SemStream [Member]	Dec. 31, 2011 SemStream [Member]	Dec. 31, 2013 Crude [Member] mi	Dec. 31, 2012 Crude [Member]	Dec. 31, 2011 Crude [Member]	Mar. 31, 2014 Subsequent Event [Member]	Dec. 31, 2013 Glass Mountain Pipeline Llc [Member]	Dec. 31, 2012 Glass Mountain Pipeline Llc [Member]	Dec. 31, 2011 Glass Mountain Pipeline Llc [Member]	Dec. 31, 2013 Glass Mountain Pipeline Llc [Member] Crude [Member] mi	Dec. 31, 2013 Ngl Energy Partners Lp [Member]		Dec. 31, 2012 Ngl Energy Partners Lp [Member]	Dec. 31, 2011 Ngl Energy Partners Lp [Member]	Sep. 30, 2013 Ngl Energy Partners Lp [Member]	Nov. 01, 2011 Ngl Energy Partners Lp [Member]	Dec. 31, 2013 White Cliffs Pipeline, LLC [Member] in	Dec. 31, 2012 White Cliffs Pipeline, LLC [Member]	Dec. 31, 2011 White Cliffs Pipeline, LLC [Member]	Dec. 31, 2013 White Cliffs Pipeline, LLC [Member] Crude [Member] mi	Dec. 31, 2013 Partnership Interest [Member] Glass Mountain Pipeline Llc [Member]	Dec. 31, 2013 Partnership Interest [Member] Glass Mountain Pipeline Llc [Member] Co-venturer [Member]	Dec. 31, 2013 Limited Partner [Member] Ngl Energy Partners Lp [Member] SemStream [Member]	Sep. 30, 2013 Limited Partner [Member] Partnership Interest [Member] Ngl Energy Partners Lp [Member] SemStream [Member]	Dec. 31, 2013 General Partner [Member] Ngl Energy Partners Lp [Member] SemStream [Member]	Sep. 30, 2013 General Partner [Member] Ngl Energy Partners Lp [Member] SemStream [Member]	Jun. 30, 2012 General Partner [Member] Ngl Energy Partners Lp [Member] SemStream [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Accumulated Capitalized Interest Costs																									$ 3,700,000
Margin deposits	838,000				1,850,000				838,000	1,850,000
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]
Gain on issuance of common units by equity method investee	26,873,000	0	0	0					26,873,000	0	0							26,873,000			0			8,100,000
Width of Pipeline																																			12
Total estimated project costs																																			300,000,000
Project funding contributions																																			95,500,000	2,300,000
General and administrative expenses									78,597,000	71,918,000	75,447,000		1,800,000	2,000,000	3,200,000			600,000	930,000	7,336,000	16,766,000	13,321,000	9,757,000
Limited partner units owned																																									9,133,409
Common units representing limited partner interests																																	71,216,230
Percentage of ownership interest																												50.00%							51.00%			51.00%	50.00%	50.00%		12.80%	11.78%	11.78%	6.42%
Estimated project contributions in 2013																																			53,300,000
Value of common units acquired																315,000,000
Length of pipeline network (in miles)																					624							210										527
Share Price	$ 65.23								$ 65.23							$ 34.50
Equity method investments	565,124,000				387,802,000				565,124,000	387,802,000								208,848,000	174,398,000		356,276,000	213,404,000			132,181,000	74,434,000			208,848,000		174,398,000			184,000,000	224,095,000	138,970,000
Partners' Capital Account, Contributions																									57,800,000	74,400,000
Earnings from equity method investments	12,788,000	7,483,000	14,861,000	17,345,000	13,133,000	3,116,000	12,289,000	7,498,000	52,477,000	36,036,000	15,004,000							7,123,000	(403,000)	0	45,354,000	36,439,000	15,004,000		(105,000)	0	0		7,123,000	[1]	(403,000)	0			45,459,000	36,439,000	15,004,000
Additional cash capital contribution																	9,500,000
Goodwill	$ 62,021,000				$ 9,884,000				$ 62,021,000	$ 9,884,000	$ 9,453,000	$ 107,823,000									$ 28,322,000	$ 0			$ 31,000,000										$ 8,700,000

[1] * Excluding gain on issuance of common units of $26.9 million.