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Equity Method Investments (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 22, 2017
Apr. 27, 2016
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]                    
Gain (loss) on issuance of common units by equity method investee   $ 0 $ 0 $ 0 $ (41,000) $ 0 $ (41,000) $ 6,385,000    
Payments to Acquire Equity Method Investments           26,444,000 4,188,000 46,730,000    
Proceeds from Sale of Equity Method Investments           0 60,483,000 56,318,000    
Proceeds from sale of common units of equity method investee           $ 0 60,483,000 56,318,000    
White Cliffs Pipeline, LLC [Member]                    
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]                    
Percentage of ownership interest 51.00%         51.00%        
Payments to Acquire Equity Method Investments           $ 1,400,000 2,200,000 42,800,000    
Ngl Energy Partners Lp [Member]                    
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]                    
Gain (loss) on issuance of common units by equity method investee             (41,000) 6,400,000    
Proceeds from Sale of Equity Method Investments             $ 60,500,000 $ 56,300,000    
Equity Method Investment Units Sold             4,652,568 1,999,533    
Proceeds from sale of common units of equity method investee             $ 60,500,000 $ 56,300,000    
Transaction related costs               500,000    
Equity Method Investment, Realized Gain (Loss) on Disposal             9,100,000 $ 14,500,000    
Glass Mountain Pipeline LLC [Member]                    
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]                    
Percentage of ownership interest               50.00% 50.00%  
Proceeds from Sale of Equity Method Investments           300,000,000        
Proceeds from sale of common units of equity method investee           300,000,000        
Equity Method Investment, Realized Gain (Loss) on Disposal $ 150,300,000         $ 150,266,000        
General Partner [Member] | Ngl Energy Partners Lp [Member]                    
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]                    
Percentage of ownership interest 11.78%         11.78%        
Limited Partner [Member] | Ngl Energy Partners Lp [Member]                    
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]                    
Equity Method Investment Units Sold Price Per Share                   $ 13.00
Equity Method Investment, Other than Temporary Impairment             $ 39,800,000