Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities (Narrative) (Details)

v3.19.3.a.u2
Derivative Instruments and Hedging Activities (Narrative) (Details) - Acquired Contingent Consideration
Jan. 31, 2020
USD ($)
Dec. 31, 2019
$ / bbl
$ / MMBTU
Subsequent Event    
Derivative [Line Items]    
Aggregate settlements limit | $ $ 13,000,000.0  
Contingent payment received | $ $ 10,000,000.0  
Minimum    
Derivative [Line Items]    
Threshold | $ / bbl   53.00
Weighted average price (in dollars per share) | $ / MMBTU   3.18
Maximum    
Derivative [Line Items]    
Threshold | $ / bbl   60.00
Weighted average price (in dollars per share) | $ / MMBTU   3.30