USE OF DERIVATIVES, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Aug. 31, 2019	Dec. 31, 2019	Dec. 31, 2010
Derivative Instruments And Hedging Activities Disclosures [Line Items]
SWAP agreement notional amount during period		$ 9,300,000	$ 100,000
SWAP agreement average interest rate during period		1.98%	4.09%
SWAP agreement terminated notional amount during period		$ 4,600,000
SWAP agreement terminated average interest rate during period		2.61%
SWAP agreement notional amount expiring during period		$ 3,850,000
SWAP agreement average interest rate expiring during period		1.47%
Futures contract notional amount during period		$ 7,400,000
Derivative instruments unrealized gains to be recognized		$ 2,800
Interest Rate Swap Agreements [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Payment term of LIBOR interest rate agreement			20 years
Eurodollar Futures Contract [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Futures contract notional amount during period	$ 500,000
Futures contract weighted average interest rate during period	1.62%
Derivative, maturity date	Jun. 30, 2020
Futures contract, average maturity (in years)	3 months
Minimum [Member] | Interest Rate Swap Agreements [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Payment term of LIBOR interest rate agreement		2 years
Maximum [Member] | Interest Rate Swap Agreements [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Payment term of LIBOR interest rate agreement		3 years