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Fair Value Measurments - Recurring - Significant Unobservable Inputs in Level 3 Valuation (Details) - Fair Value, Inputs, Level 3 [Member]
 6 Months Ended
Jun. 30, 2017
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Number Of Renewal Periods 2
Embedded Derivative Renewal Term 5 years
Liability [Member] | Embedded derivatives in commodity contracts  
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Fair Value Inputs Probability of Renewal 50.00% [1]
Fair Value Inputs Probability of Renewal Second Term 75.00% [1]
[1] The producer counterparty to the embedded derivative has the option to renew the gas purchase agreement and the related keep-whole processing agreement for two successive five-year terms after 2022. The embedded gas purchase agreement cannot be renewed without the renewal of the related keep-whole processing agreement. Due to the significant number of years until the renewal options are exercisable and the high level of uncertainty regarding the counterparty’s future business strategy, the future commodity price environment, and the future competitive environment for midstream services in the Southern Appalachian region, management determined that a 50 percent probability of renewal for the first five-year term and 75 percent for the second five-year term are appropriate assumptions. Included in this assumption is a further extension of management’s estimates of future frac spreads through 2032.