Quarterly report pursuant to Section 13 or 15(d)

Derivatives And Fair Value (Effect Of Derivative Instruments On The Condensed Consolidated Statements Of Operations) (Details)

v3.19.1
Derivatives And Fair Value (Effect Of Derivative Instruments On The Condensed Consolidated Statements Of Operations) (Details) - Crude Oil Swaps [Member]
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative, gain (loss) $ (1,912)
Realized Gain - Contract Settlements [Member]  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative, gain (loss) 1,131
Unrealized Loss [Member]  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative, gain (loss) $ (3,043)