Consolidated Statements of Changes in Owners' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2014	$ 1,219,437	$ 436	$ 1,245,877	$ (1,332)	$ (68,332)	$ (27,141)	$ 69,929
Net income (loss)	42,812				30,320		12,492
Other comprehensive income (loss), net of income taxes	(31,421)					(31,421)
Distributions to noncontrolling interests	(40,410)						(40,410)
Non-cash equity compensation	10,405		9,051				1,354
Issuance of common stock under compensation plans	1,515	3	1,512
Treasury Stock, Value, Acquired, Cost Method	(4,261)			(4,261)
Rose Rock equity issuance	89,119						89,119
Transfer to subsidiary in common control transaction	(20,772)		30,680				(51,452)
Dividends paid	(69,514)		(69,514)
Unvested dividend equivalent rights	(554)		(351)				(203)
Ending Balance at Dec. 31, 2015	1,196,356	439	1,217,255	(5,593)	(38,012)	(58,562)	80,829
Net income (loss)	13,262				2,095		11,167
Other comprehensive income (loss), net of income taxes	(15,352)					(15,352)
Distributions to noncontrolling interests	(32,133)						(32,133)
Non-cash equity compensation	9,945		8,752				1,193
Issuance of common stock under compensation plans	1,237	1	1,236
Treasury Stock, Value, Acquired, Cost Method	(965)			(965)
Dividends paid	(92,910)		(92,910)
Unvested dividend equivalent rights	587		521				66
Issuance of common stock	228,546	86	228,460
Acquisition of Rose Rock's noncontrolling interest	137,392	133	198,381				(61,122)
Ending Balance at Dec. 31, 2016	1,445,965	659	1,561,695	(6,558)	(35,917)	(73,914)	0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	288	0	(2,073)	0	2,361	0	0
Net income (loss)	(17,150)				(17,150)		0
Other comprehensive income (loss), net of income taxes	20,113
Non-cash equity compensation	10,066		10,066
Stock Issued During Period, Value, Acquisitions	330,341	124	330,217
Issuance of common stock under compensation plans	1,173	3	1,170
Treasury Stock, Value, Acquired, Cost Method	(1,473)			(1,473)
Dividends paid	(129,925)		(129,925)
Unvested dividend equivalent rights	(1,033)		(1,033)
Ending Balance at Dec. 31, 2017	$ 1,658,365	$ 786	$ 1,770,117	$ (8,031)	$ (50,706)	$ (53,801)	$ 0