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Equity Method Investments (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Apr. 27, 2016
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]        
Loss on issuance of common units by equity method investee $ 0 $ 0 $ (41,000)  
Payments to Acquire Equity Method Investments 7,781,000 26,444,000 4,188,000  
Proceeds from Sale of Equity Method Investments $ 0 0 60,483,000  
White Cliffs Pipeline, LLC [Member]        
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]        
Percentage of ownership interest 51.00%      
Payments to Acquire Equity Method Investments $ 6,500,000 1,400,000 2,200,000  
Remaining expected capital contributions year one 27,200,000      
Ngl Energy Partners Lp [Member]        
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]        
Loss on issuance of common units by equity method investee     (41,000.0)  
Glass Mountain Pipeline LLC [Member]        
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]        
Proceeds from Sale of Equity Method Investments   300,000,000    
Equity Method Investment, Realized Gain (Loss) on Disposal $ 1,100,000 $ 150,266,000    
General Partner [Member] | Ngl Energy Partners Lp [Member]        
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]        
Percentage of ownership interest 11.78%      
Limited Partner [Member] | Ngl Energy Partners Lp [Member]        
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]        
Loss on issuance of common units by equity method investee     (41,000.0)  
Proceeds from Sale of Equity Method Investments     $ 60,500,000  
Equity Method Investment Units Sold     4,652,568  
Equity Method Investment Units Sold Price Per Share       $ 13.00
Equity Method Investment, Realized Gain (Loss) on Disposal     $ 9,100,000  
Equity Method Investment, Other than Temporary Impairment     $ 39,800,000