Annual report pursuant to Section 13 and 15(d)

Equity Method Investment (Details)

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Equity Method Investment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Equity Method Investment    
Carrying value of investment $ 68,299  
Distribution of earnings from unconsolidated affiliates 7,702  
Partnership’s share of net income 485  
Stonewall Gas Gathering LLC    
Equity Method Investment    
Carrying value of investment 68,300 $ 0
Distribution of earnings from unconsolidated affiliates 7,700  
Partnership’s share of net income $ 500 $ 0