Related Parties - Monarch Natural Gas, LLC Equity Interests (Details) - Monarch Natural Gas, LLC - Investee - USD ($) $ in Millions |
12 Months Ended | |||
|---|---|---|---|---|
May 07, 2013 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Related Party Transactions | ||||
| Estimated fair value of equity interests issued to the entity | $ 15.0 | |||
| Amortization of deferred revenue | $ 2.4 | $ 2.0 | $ 1.2 | |
| Value of equity interests from related party | 15.0 | |||
| Value of equity interests assigned to Jonny Jones | 2.4 | |||
| Value of equity interests reserved for an incentive plan established for certain of the entity's officers | 2.6 | |||
| Value of remaining equity interests distributed to certain of the pre-IPO owners | $ 10.0 | |||
| Equity interests distributed to management | 0.6 | 0.8 | 0.5 | |
| Allocated Share-based Compensation Expense | 0.5 | $ 0.5 | $ 0.8 | |
| Other assets | ||||
| Related Party Transactions | ||||
| Estimated fair value of equity interests issued to the entity | $ 0.7 | |||