Annual report pursuant to Section 13 and 15(d)

Financial Instruments (Details)

v3.10.0.1
Financial Instruments (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Bcf
Not Designated as Hedging Instrument | Non-current asset  
Derivatives, Fair Value [Line Items]  
Derivative asset $ 0.6
Not Designated as Hedging Instrument | Current asset  
Derivatives, Fair Value [Line Items]  
Derivative asset 0.4
Not Designated as Hedging Instrument | Current liabilities  
Derivatives, Fair Value [Line Items]  
Derivative liability 0.6
Not Designated as Hedging Instrument | Non-current liability  
Derivatives, Fair Value [Line Items]  
Derivative liability $ 0.3
Basis Swap  
Derivatives, Fair Value [Line Items]  
Hedged portions of expected sales of equity production | Bcf 19.3
Commodity swaps  
Derivatives, Fair Value [Line Items]  
Hedged portions of expected sales of equity production | Bcf 19.3
Commodity swaps | Not Designated as Hedging Instrument  
Derivatives, Fair Value [Line Items]  
Loss on derivative $ 0.1
Unrealized gain derivatives 0.1
Level 2 | Commodity swaps | Not Designated as Hedging Instrument | Accrued liabilities  
Derivatives, Fair Value [Line Items]  
Derivative liability 0.2
Level 2 | Commodity swaps | Not Designated as Hedging Instrument | Non-current asset  
Derivatives, Fair Value [Line Items]  
Derivative asset $ 0.3