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Supplemental Cash Flow Information (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Transfer of WOT and Glass Mountain to Rose Rock       $ (19,288)  
Tax effect of adjustment to APIC from sale of equity investment to less than wholly owned subsidiary   $ 19,300 $ 31,800    
Interest Paid       40,500 $ 21,600
Income Taxes Paid, Net       6,300 17,900
Capital Expenditures Incurred but Not yet Paid       7,300 $ 13,400
Noncontrolling Interest [Member]          
Transfer of WOT and Glass Mountain to Rose Rock   (51,452) (85,173) (51,452)  
Additional Paid-in Capital [Member]          
Transfer of WOT and Glass Mountain to Rose Rock   $ 32,164 $ 53,370 $ 32,164  
Glass Mountain Pipeline LLC [Member]          
Equity method investment, ownership percentage       50.00%  
SemCAMS [Member]          
Asset Retirement Obligation, Revision of Estimate $ (26,000)        
Acquisition of remaining 33% interest in SemCrude Pipeline [Member] | Semcrude Pipeline [Member] | Rose Rock Midstream L P [Member]          
Equity method investment, ownership percentage     33.00%