USE OF DERIVATIVES, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2010
Derivative Instruments And Hedging Activities Disclosures [Line Items]
SWAP agreement notional amount during period	$ 2,800,000	$ 100,000
SWAP agreement average interest rate during period	1.14%	4.09%
Swap agreement notional amount expiring during period	$ 600,000
SWAP agreement average interest rate expiring during period	2.07%
SWAP agreement terminated notional amount during period	$ 5,200,000
SWAP agreement terminated average interest rate during period	1.67%
Futures contract notional amount during period	$ 4,400,000
Derivative instruments unrealized gains to be recognized	$ 4,800
Interest Rate Swap Agreements [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Payment term of LIBOR interest rate agreement		20 years
Interest Rate Swap Agreements [Member] | Minimum [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Payment term of LIBOR interest rate agreement	18 months
Interest Rate Swap Agreements [Member] | Maximum [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Payment term of LIBOR interest rate agreement	3 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