DERIVATIVES (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Aggregate notional amount of interest rate swaps	$ 625,000,000	$ 725,000,000
Interest Rate Swap | Fair Value Hedging
Derivative [Line Items]
Aggregate notional amount of interest rate swaps	625,000,000
Face value of medium-term notes		$ 10,000,000
Interest Rate Swap | Cash Flow Hedging
Derivative [Line Items]
Aggregate notional amount of interest rate swaps	215,000,000
Face value of medium-term notes	7,000,000
Cross Currency Interest Rate Contract | Cash Flow Hedging
Derivative [Line Items]
Aggregate notional amount of interest rate swaps	$ 50,000,000