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Equity Method Investments (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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) $ 352,000 $ 136,000 $ 5,897,000 $ 0 $ (41,000) $ 6,385,000 $ 29,020,000  
Payments to Acquire Equity Method Investments                 4,188,000 46,730,000 71,131,000  
Proceeds from sale of common units of equity method investee                 60,483,000 56,318,000 79,741,000  
Proceeds from Sale of Equity Method Investments                 $ 60,483,000 56,318,000 79,741,000  
White Cliffs Pipeline, LLC [Member]                        
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]                        
Percentage of ownership interest 51.00%               51.00%      
Equity Method Investment Management Services Provided General and Administrative Expenses                 $ 1,600,000 1,300,000 1,600,000  
Payments to Acquire Equity Method Investments                 2,200,000 42,800,000 53,300,000  
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 $ 29,000,000  
Equity Method Investment Units Sold                 4,652,568 1,999,533 2,481,308  
Equity Method Investment Units Sold Price Per Share                       $ 13.00
Proceeds from sale of common units of equity method investee                 $ 60,500,000 $ 56,300,000 $ 88,800,000  
Proceeds from Sale of Equity Method Investments                 60,500,000 56,300,000 88,800,000  
Transaction related costs                   500,000 3,100,000  
Gain on sale of interests in SemCrude Pipeline                 $ 9,100,000 14,500,000 34,200,000  
Glass Mountain Pipeline LLC [Member]                        
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]                        
Percentage of ownership interest 50.00%               50.00%      
Payments to Acquire Equity Method Investments                 $ 300,000 $ 2,700,000 $ 16,200,000  
Equity Method Goodwill $ 31,000,000               31,000,000      
Accumulated Capitalized Interest Costs $ 3,600,000               $ 3,600,000      
General Partner [Member] | Ngl Energy Partners Lp [Member]                        
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]                        
Percentage of ownership interest 11.78%               11.78%      
General Partner [Member] | Ngl Energy Partners Lp [Member] | SemStream [Member]                        
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]                        
Percentage of ownership interest 11.78%               11.78%      
Limited Partner [Member] | Ngl Energy Partners Lp [Member]                        
Business Acquisition, Equity Interests Issued or Issuable [Line Items]                        
Equity Method Investment, Other than Temporary Impairment                 $ 39,800,000      
Investment in Non Consolidated Subsidiaries (Textual) [Abstract]                        
Share price         $ 11.04         $ 11.04