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SENIOR NOTES PAYABLE AND OTHER DEBT - Credit Facilities, Commerical Paper and Unsecured Term Loans (Details) $ in Thousands, $ in Millions	1 Months Ended		3 Months Ended			9 Months Ended
	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) period	Sep. 30, 2018 USD ($)	Sep. 30, 2019 CAD ($)	Dec. 31, 2018 USD ($)
Debt instruments
Commercial paper program capacity	$ 1,000,000		$ 1,000,000			$ 1,000,000
Commercial paper	305,000		305,000			305,000			$ 0
Loss on extinguishment of debt, net			37,434		$ 39,527	41,861	$ 50,411
Revolving Credit Facility
Debt instruments
Letters of credit outstanding	24,000		24,000			24,000
Unsecured debt \| Revolving Credit Facility
Debt instruments
Revolving credit facility, maximum borrowing capacity	3,000,000		3,000,000			$ 3,000,000
Additional periods \| period						2
Additional period term						6 months
Accordion feature of debt	3,750,000		3,750,000			$ 3,750,000
Revolving credit facility borrowings outstanding	983,788		983,788			983,788			765,919
Line of credit, remaining availability less commercial paper	1,700,000		1,700,000			$ 1,700,000
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			$ 800,000
Repayments of debt		$ 100,000
Unsecured debt	200,000		200,000			$ 200,000			300,000
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
Revolving credit facility, maximum borrowing capacity	400,000		400,000			$ 400,000
Revolving credit facility borrowings outstanding	143,108		143,108			143,108			90,488
Unsecured Term Loan due 2024
Debt instruments
Repayments of debt		$ 600,000
Unsecured debt	0		0			0			600,000
Unsecured Term Loans Due 2023 and 2024
Debt instruments
Loss on extinguishment of debt, net				$ 3,200
Unsecured Term Loan due 2025
Debt instruments
Unsecured debt	$ 377,672		$ 377,672			$ 377,672		$ 500	$ 0
Unsecured Term Loan due 2025 \| Canadian Dollar Offered Rate (CDOR)
Debt instruments
Variable interest rate	0.90%