Equity-Based Compensation (Tables)
|6 Months Ended|
Jun. 30, 2018
|Disclosure of Compensation Related Costs, Share-based Payments [Abstract]|
|Grant Date Fair Value for Awards of Performance Units Inputs||
The grant date fair values for awards of performance units with market-based metrics, which were granted in the six months ended June 30, 2018 and 2017, were determined using a Monte Carlo simulation valuation methodology using the following key inputs:
Schedule Of Share Based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions [Table Text Block]
No definition available.