BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) reporting_units	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of reportable segments | reporting_units	3
Accounting Standards Update	us-gaap:AccountingStandardsUpdate201613Member
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected	us-gaap:AccountingStandardsUpdate201613ModifiedProspectiveMember
Stockholders' equity	$ 27,632,989	$ 27,520,433	$ 28,054,989	$ 4,175,116	$ 4,142,461	$ 4,186,343
Allowance for credit losses	39,900
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity	$ 2,314,423	$ 2,335,407	2,333,011	$ 2,204,445	$ 2,111,798	$ 2,066,415
Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity			(5,379)
Adjustment | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity			$ (5,379)