Investments in Non-Controlled Entities (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Change in Equity Method Investments [Roll Forward]
Investments at December 31, 2014			$ 613,867,000
Additional Investment in NonControlled Entities			146,625,000
Proportionate share of earnings			51,745,000
Amortization of excess investment and capitalized interest			(2,092,000)
Earnings of non-controlled entities	$ 15,521,000	$ 1,645,000	49,653,000	$ 4,066,000
Distributions of earnings from investments in non-controlled entities			47,236,000	2,398,000
Distributions in excess of earnings of non-controlled entities			9,341,000	3,918,000
Investments at September 30, 2015	753,568,000		753,568,000
Equity Method Investment, Summarized Financial Information, Revenue	60,085,000	9,310,000	179,997,000	27,774,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	$ 32,301,000	3,667,000	$ 103,331,000	9,258,000
Texas Frontera Llc [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	50.00%		50.00%
Powder Springs Logistics, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	50.00%		50.00%
Saddlehorn Pipeline Company [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	40.00%		40.00%
Seabrook Logistics, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	50.00%		50.00%
Osage Pipeline Co [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	50.00%		50.00%
Double Eagle Pipeline Llc [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	50.00%		50.00%
BridgeTex [Member]
Schedule of Equity Method Investments [Line Items]
Interest in equity method investment	50.00%		50.00%
Change in Equity Method Investments [Roll Forward]
Investments at December 31, 2014			$ 489,348,000
Additional Investment in NonControlled Entities			16,608,000
Proportionate share of earnings			45,903,000
Amortization of excess investment and capitalized interest			(1,529,000)
Earnings of non-controlled entities			44,374,000
Distributions of earnings from investments in non-controlled entities			44,374,000
Distributions in excess of earnings of non-controlled entities			9,341,000
Investments at September 30, 2015	$ 496,615,000		496,615,000
Equity Method Investment, Summarized Financial Information, Revenue	47,555,000	428,000	146,320,000	428,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	28,150,000	297,000	91,806,000	17,000
All Other Equity Investments [Member]
Change in Equity Method Investments [Roll Forward]
Investments at December 31, 2014			124,519,000
Additional Investment in NonControlled Entities			130,017,000
Proportionate share of earnings			5,842,000
Amortization of excess investment and capitalized interest			(563,000)
Earnings of non-controlled entities			5,279,000
Distributions of earnings from investments in non-controlled entities			2,862,000
Distributions in excess of earnings of non-controlled entities			0
Investments at September 30, 2015	256,953,000		256,953,000
Equity Method Investment, Summarized Financial Information, Revenue	12,530,000	8,882,000	33,677,000	27,346,000
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	4,151,000	3,370,000	11,525,000	9,241,000
Equity Method Investee [Member] | Saddlehorn Pipeline Company [Member]
Schedule of Equity Method Investments [Line Items]
Related Party Transaction, Amounts of Transaction	(200,000)
Equity Method Investee [Member] | Double Eagle Pipeline Llc [Member]
Schedule of Equity Method Investments [Line Items]
Related Party Transaction, Other Revenues from Transactions with Related Party	800,000	$ 700,000	2,600,000	$ 2,000,000
Accounts Receivable, Related Parties, Current	300,000		300,000		$ 300,000
Equity Method Investee [Member] | BridgeTex [Member]
Schedule of Equity Method Investments [Line Items]
Accounts Payable, Related Parties, Current	500,000		500,000		2,200,000
Related Party Transaction, Other Revenues from Transactions with Related Party	8,900,000		25,800,000
Accounts Receivable, Related Parties, Current	0		$ 0		$ 2,600,000
Related Party Transaction, Amounts of Transaction	$ 600,000