XML 57 R45.htm IDEA: XBRL DOCUMENT v3.19.2
RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES Part 3 (Details) - Cash Flow Hedging [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive (Loss), Net $ (74,064) $ (26,323) $ (163,601) $ 18,513
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Net 10,429 (15,791) 26,777 (31,345)
Commodity Contract [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive (Loss), Net 33,334 (46,388) 11,709 (25,463)
Commodity Contract [Member] | Commodity sales revenues/ cost of sales and fuel        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Net 15,244 (10,189) 34,096 (21,800)
Interest Rate Contract [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive (Loss), Net (107,398) 20,065 (175,310) 43,976
Interest Rate Contract [Member] | Interest expense        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Net $ (4,815) $ (5,602) $ (7,319) $ (9,545)