Equity Method Investments (Details Textual) $ / shares in Units, bbl in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($) bbl $ / shares shares	Dec. 31, 2015 $ / shares shares	Mar. 31, 2015 USD ($) shares	Apr. 27, 2016 $ / shares
Schedule of Equity Method Investments [Line Items]
Loss on issuance of common units by equity method investee		$ (41)		$ 0
General and administrative		21,060		32,310
Net proceeds from sale of common units of equity method investee		0		29,012
White Cliffs Pipeline, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
General and administrative		500		$ 300
NGL Energy Partners LP [Member]
Schedule of Equity Method Investments [Line Items]
Common units representing limited partner interests | shares			105,383,639
NGL Energy Partners LP [Member]
Schedule of Equity Method Investments [Line Items]
Loss on issuance of common units by equity method investee		$ 0
Common units | shares		4,652,568
Closing price per common unit | $ / shares		$ 7.52	$ 11.04		$ 13.00
Units of equity investee divested | shares				999,533
Net proceeds from sale of common units of equity method investee				$ 29,000
Transaction related costs				400
Gain on sale of common units of equity method investee				$ 7,900
NGL Energy Partners LP [Member] | Limited Partner Interests [Member]
Schedule of Equity Method Investments [Line Items]
Limited partner ownership interest			4.40%
NGL Energy Partners LP [Member] | General Partner [Member]
Schedule of Equity Method Investments [Line Items]
General partner ownership interest		11.78%
White Cliffs Pipeline, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of limited partner ownership interest		51.00%
Glass Mountain Pipeline LLC [Member]
Schedule of Equity Method Investments [Line Items]
Project funding contributions		$ 300
Percentage of limited partner ownership interest		50.00%
Pipeline expansion [Member] | White Cliffs Pipeline, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Project funding contributions		$ 500
Incremental capacity expected to be added | bbl		65
Expected capital contributions, year one		$ 1,700
Subsequent Event [Member] | NGL Energy Partners LP [Member]
Schedule of Equity Method Investments [Line Items]
Gain on sale of common units of equity method investee	$ 9,100
Fair Value, Inputs, Level 1 [Member] | NGL Energy Partners LP [Member]
Schedule of Equity Method Investments [Line Items]
Fair market value of common units		$ 35,000