Rose Rock Midstream, L.P. - Summarized income statement information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Summarized Income Statement Information
Revenue	$ 287,377	$ 377,226	$ 602,228	$ 675,536
Cost of products sold	176,842	244,158	373,789	436,230
Depreciation and amortization	25,048	24,674	49,095	48,408
Earnings from equity method investments	17,078	23,903	40,149	44,462
Net income	9,931	28,433	3,683	34,209
Rose Rock Midstream, L.P. [Member]
Summarized Income Statement Information
Revenue	169,144	223,303	373,095	357,996
Cost of products sold	128,763	173,133	280,154	269,370
Operating, general and administrative expenses	26,868	29,985	53,469	56,556
Depreciation and amortization	8,235	10,608	16,128	20,751
Earnings from equity method investments	17,078	17,683	37,917	38,547
Net income	$ 9,922	$ 17,068	$ 36,390	$ 31,668