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Related Parties - Monarch Natural Gas, LLC Equity Interests (Details) - Monarch Natural Gas, LLC - Investee - USD ($)
$ in Millions
3 Months Ended
May 07, 2013
Mar. 31, 2017
Mar. 31, 2016
Related Party Transactions      
Estimated fair value of equity interests issued to the entity $ 15.0    
Amortization of deferred revenue   $ 0.5 $ 0.6
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   0.0  
Stock compensation expense   0.1  
Other assets      
Related Party Transactions      
Estimated fair value of equity interests issued to the entity   $ 0.7