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FAIR VALUE MEASUREMENTS - Part 1 (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
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 13,300 8,800
Long-term debt, Fair Value 15,000,000 13,800,000
Long-term debt 14,300,000 12,500,000
Fair Value, Recurring [Member]    
Derivative assets    
Derivative assets 28,445 38,442
Derivative assets netting (52,719) (28,588)
Derivative liabilities    
Derivative liabilities (245,244) (202,949)
Derivative liabilities netting 52,719 28,588
Fair Value, Recurring [Member] | Financial Contracts [Member]    
Derivative assets    
Derivative assets 28,445 37,861
Derivative assets netting (52,719) (28,588)
Derivative liabilities    
Derivative liabilities (4,039) (1,008)
Derivative liabilities netting 52,719 28,588
Fair Value, Recurring [Member] | Interest-rate contracts    
Derivative assets    
Interest-rate contracts   581
Derivative assets netting   0
Derivative liabilities    
Interest rate derivative liabilities, at fair value (241,205) (201,941)
Derivative liabilities netting 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Derivative assets    
Derivative asset, fair value, gross 29,175 10,892
Derivative liability, fair value, gross (10,352) (4,811)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Financial Contracts [Member]    
Derivative assets    
Derivative asset, fair value, gross 29,175 10,892
Derivative liability, fair value, gross (10,352) (4,811)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest-rate contracts    
Derivative assets    
Interest-rate contracts   0
Derivative liabilities    
Interest rate derivative liabilities, at fair value 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Derivative assets    
Derivative asset, fair value, gross 0 581
Derivative liability, fair value, gross (241,205) (201,941)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Financial Contracts [Member]    
Derivative assets    
Derivative asset, fair value, gross 0 0
Derivative liability, fair value, gross 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest-rate contracts    
Derivative assets    
Interest-rate contracts   581
Derivative liabilities    
Interest rate derivative liabilities, at fair value (241,205) (201,941)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Derivative assets    
Derivative asset, fair value, gross 51,989 55,557
Derivative liability, fair value, gross (46,406) (24,785)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Financial Contracts [Member]    
Derivative assets    
Derivative asset, fair value, gross 51,989 55,557
Derivative liability, fair value, gross (46,406) (24,785)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest-rate contracts    
Derivative assets    
Interest-rate contracts   0
Derivative liabilities    
Interest rate derivative liabilities, at fair value 0 0
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member]    
Derivative assets    
Derivative asset, fair value, gross 81,164 67,030
Derivative liability, fair value, gross (297,963) (231,537)
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Financial Contracts [Member]    
Derivative assets    
Derivative asset, fair value, gross 81,164 66,449
Derivative liability, fair value, gross (56,758) (29,596)
Fair Value, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Interest-rate contracts    
Derivative assets    
Interest-rate contracts   581
Derivative liabilities    
Interest rate derivative liabilities, at fair value $ (241,205) $ (201,941)