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FAIR VALUE MEASUREMENTS - Part 1 (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash held - offsetting derivative net asset positions under master-netting arrangements	$ 0	$ 0
Cash posted - total	600	800
Long-term debt, Fair Value	12,100,000	9,600,000
Long-term debt	11,100,000	9,400,000
Fair Value, Recurring [Member]
Derivative assets
Financial contracts	28,083	47,238
Physical contracts	1,074	1,142
Interest-rate contracts		19,005
Total derivative assets	29,157	67,385
Derivative assets netting	(38,115)	(32,739)
Derivative liabilities
Financial contracts	(790)	0
Interest-rate contracts	(256,940)	(99,260)
Total derivative liabilities	(257,730)	(99,260)
Derivative liabilities netting	38,115	32,739
Fair Value, Recurring [Member] | Financial Contracts [Member]
Derivative assets
Derivative assets netting	(38,115)	(32,739)
Derivative liabilities
Derivative liabilities netting	38,115	32,739
Fair Value, Recurring [Member] | Interest Rate Contract [Member]
Derivative assets
Derivative assets netting		0
Derivative liabilities
Derivative liabilities netting	0	0
Fair Value, Recurring [Member] | Physical Contracts [Member]
Derivative assets
Derivative assets netting	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative assets
Financial contracts	11,874	10,812
Physical contracts	0	0
Interest-rate contracts		0
Total derivative assets	11,874	10,812
Derivative liabilities
Financial contracts	(2,781)	(2,916)
Interest-rate contracts	0	0
Total derivative liabilities	(2,781)	(2,916)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative assets
Financial contracts	0	0
Physical contracts	0	0
Interest-rate contracts		19,005
Total derivative assets	0	19,005
Derivative liabilities
Financial contracts	0	0
Interest-rate contracts	(256,940)	(99,260)
Total derivative liabilities	(256,940)	(99,260)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative assets
Financial contracts	54,324	69,165
Physical contracts	1,074	1,142
Interest-rate contracts		0
Total derivative assets	55,398	70,307
Derivative liabilities
Financial contracts	(36,124)	(29,823)
Interest-rate contracts	0	0
Total derivative liabilities	(36,124)	(29,823)
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Derivative assets
Financial contracts	66,198	79,977
Physical contracts	1,074	1,142
Interest-rate contracts		19,005
Total derivative assets	67,272	100,124
Derivative liabilities
Financial contracts	(38,905)	(32,739)
Interest-rate contracts	(256,940)	(99,260)
Total derivative liabilities	$ (295,845)	$ (131,999)

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