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Equity Method Investments (Details)
$ in Thousands
3 Months Ended
Feb. 10, 2017
USD ($)
shares
Feb. 06, 2017
Mar. 31, 2017
USD ($)
Jun. 30, 2016
mi
Equity Method Investment        
Contribution to joint venture     $ 159,889  
Investments in unconsolidated affiliates        
Balance at beginning of period     68,299  
Initial investment     153,770  
Additional investment     6,119  
Equity in net income (loss) of unconsolidated affiliates     2,231  
Balance at end of period     230,419  
Common Unitholders Public        
Equity Method Investment        
Sale of units to public (in shares) | shares 6,900,000      
Net proceeds from sale of units $ 223,000      
Appalachia Joint venture        
Equity Method Investment        
Ownership percentage   50.00%    
Percentage of interest held by joint venture in third party fractionator in Ohio   33.33%    
Contribution to joint venture     160,000  
Investments in unconsolidated affiliates        
Initial investment     153,770  
Additional investment     6,119  
Equity in net income (loss) of unconsolidated affiliates     (244)  
Balance at end of period     159,645  
Appalachia Joint venture | MarkWest        
Equity Method Investment        
Ownership percentage   50.00%    
Stonewall Gas Gathering LLC        
Equity Method Investment        
Ownership percentage       15.00%
Number of miles | mi       67
Investments in unconsolidated affiliates        
Balance at beginning of period     68,299  
Equity in net income (loss) of unconsolidated affiliates     2,475  
Balance at end of period     $ 70,774