Rose Rock Midstream, L.P. - Summarized income statement information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Summarized Income Statement Information
Revenue	$ 314,851	$ 298,310
Cost of products sold	196,947	192,072
Depreciation and amortization	24,047	23,734
Earnings from equity method investments	23,071	20,559
Net income (loss)	(6,248)	5,776
Rose Rock Midstream, L.P. [Member]
Summarized Income Statement Information
Revenue	203,951	134,693
Cost of products sold	151,391	96,237
Operating, general and administrative expenses	26,601	26,571
Depreciation and amortization	7,893	10,143
Earnings from equity method investments	20,839	20,864
Net income (loss)	$ 26,468	$ 14,600