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FAIR VALUE MEASUREMENTS - Part 1 (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash held - offsetting derivative net asset positions under master-netting arrangements	$ 0	$ 0
Cash posted - total	8,800	800
Cash posted - offsetting derivative net liability positions under master-netting arrangements	0	0
Long-term Debt, Fair Value	13,800,000	9,600,000
Long-term Debt	12,500,000	9,400,000
Fair Value, Recurring [Member]
Derivative assets
Financial contracts	37,861	47,238
Physical contracts		1,142
Interest-rate contracts	581	19,005
Total derivative assets	38,442	67,385
Derivative assets netting	(28,588)	(32,739)
Derivative Liabilities
Financial contracts	(1,008)	0
Interest-rate contracts	(201,941)	(99,260)
Total derivative liabilities	(202,949)	(99,260)
Derivative liabilities netting	28,588	32,739
Fair Value, Recurring [Member] | Gross Fair Value Measurement [Member]
Derivative assets
Financial contracts	66,449	79,977
Physical contracts		1,142
Interest-rate contracts	581	19,005
Total derivative assets	67,030	100,124
Derivative Liabilities
Financial contracts	(29,596)	(32,739)
Interest-rate contracts	(201,941)	(99,260)
Total derivative liabilities	(231,537)	(131,999)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative assets
Financial contracts	10,892	10,812
Physical contracts		0
Interest-rate contracts	0	0
Total derivative assets	10,892	10,812
Derivative Liabilities
Financial contracts	(4,811)	(2,916)
Interest-rate contracts	0	0
Total derivative liabilities	(4,811)	(2,916)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative assets
Financial contracts	0	0
Physical contracts		0
Interest-rate contracts	581	19,005
Total derivative assets	581	19,005
Derivative Liabilities
Financial contracts	0	0
Interest-rate contracts	(201,941)	(99,260)
Total derivative liabilities	(201,941)	(99,260)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative assets
Financial contracts	55,557	69,165
Physical contracts		1,142
Interest-rate contracts	0	0
Total derivative assets	55,557	70,307
Derivative Liabilities
Financial contracts	(24,785)	(29,823)
Interest-rate contracts	0	0
Total derivative liabilities	(24,785)	(29,823)
Interest Rate Contract | Fair Value, Recurring [Member]
Derivative assets
Derivative assets netting	0	0
Derivative Liabilities
Derivative liabilities netting	0	0
Physical Contracts [Member] | Fair Value, Recurring [Member]
Derivative assets
Derivative assets netting		0
Financial contracts | Fair Value, Recurring [Member]
Derivative assets
Derivative assets netting	(28,588)	(32,739)
Derivative Liabilities
Derivative liabilities netting	$ 28,588	$ 32,739

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