BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) reporting_units	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Retained Earnings Adjustments [Line Items]
Number of reportable segments | reporting_units	3
Cumulative effect of adoption of new accounting standard	$ 27,520,433		$ 28,054,989	$ 4,142,461	$ 4,186,343
Allowance for credit losses	29,300
Retained Earnings
Retained Earnings Adjustments [Line Items]
Cumulative effect of adoption of new accounting standard	$ 2,335,407		$ 2,333,011	$ 2,111,798	$ 2,066,415
Adjustment
Retained Earnings Adjustments [Line Items]
Cumulative effect of adoption of new accounting standard		$ (5,379)
Adjustment | Retained Earnings
Retained Earnings Adjustments [Line Items]
Cumulative effect of adoption of new accounting standard		(5,379)
Adjustment | Accounting Standards Update 2016-13 | Retained Earnings
Retained Earnings Adjustments [Line Items]
Cumulative effect of adoption of new accounting standard		$ (5,400)