Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS (Derivative Instruments in Financial Position) (Details)

v3.19.2
DERIVATIVE INSTRUMENTS (Derivative Instruments in Financial Position) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
General Discussion of Derivative Instruments and Hedging Activities [Abstract]    
Short-term derivative instruments - asset $ 134,920 $ 21,352
Long-term derivative instruments - asset 5,036 0
Short-term derivative instruments - liability 198 20,401
Long-term derivative instruments - liability $ 210 $ 13,992