Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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SENIOR NOTES PAYABLE AND OTHER DEBT - Credit Facilities, Commerical Paper and Unsecured Term Loans (Details) $ in Thousands, $ in Billions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) period	Jun. 30, 2019 USD ($)	Jun. 30, 2020 CAD ($)	Dec. 31, 2019 USD ($)
Debt instruments
Commercial paper program capacity	$ 1,000,000		$ 1,000,000
Commercial paper	0		0			$ 567,450
Loss on extinguishment of debt, net	0	$ 4,022	$ 0	$ 4,427
Unsecured debt \| Revolving Credit Facility
Debt instruments
Additional periods \| period			2
Additional period term			6 months
Accordion feature of debt	3,750,000		$ 3,750,000
Fair value of amount outstanding	587,206		587,206			120,787
Letters of credit outstanding	23,900		23,900
Line of credit, remaining availability less commercial paper	2,400,000		$ 2,400,000
Unsecured debt \| Revolving Credit Facility \| LIBOR
Debt instruments
Variable interest rate			0.875%
Unsecured Term Loan Due 2023
Debt instruments
Accordion feature of debt	800,000		$ 800,000
Unsecured debt	200,000		$ 200,000			200,000
Unsecured Term Loan Due 2023 \| LIBOR
Debt instruments
Variable interest rate			0.90%
Secured revolving construction credit facility due 2022 \| Revolving Credit Facility
Debt instruments
Maximum borrowing capacity	400,000		$ 400,000
Fair value of amount outstanding	157,156		157,156			160,492
Unsecured Term Loan due 2025
Debt instruments
Unsecured debt	$ 368,378		$ 368,378		$ 0.5	$ 385,030
Unsecured Term Loan due 2025 \| Canadian Dollar Offered Rate (CDOR)
Debt instruments
Variable interest rate			0.90%