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DEBT - Senior Unsecured Notes (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019	Oct. 07, 2019	May 29, 2019
Debt Instrument [Line Items]
Premium, net	$ 6,740,000
Deferred financing costs	18,418,000
Senior Notes
Debt Instrument [Line Items]
Principal balance	1,250,000,000	$ 1,250,000,000
Premium, net	6,740,000	7,600,000
Deferred financing costs	8,416,000	8,800,000
Senior Notes \| 4.80% senior unsecured notes due 2024 (“2024 Notes”)
Debt Instrument [Line Items]
Principal balance	$ 300,000,000	300,000,000
Interest rate	4.80%			4.80%
Senior Notes \| 5.125% senior unsecured notes due 2026 (“2026 Notes”)
Debt Instrument [Line Items]
Principal balance	$ 500,000,000	500,000,000
Interest rate	5.125%
Senior Notes \| 5.88% senior unsecured notes due 2027 (“2027 Notes”)
Debt Instrument [Line Items]
Principal balance	$ 100,000,000	100,000,000
Interest rate	5.88%
Senior Notes \| 3.90% senior unsecured notes due 2029 (“2029 Notes”)
Debt Instrument [Line Items]
Principal balance	$ 350,000,000	$ 350,000,000
Interest rate	3.90%		3.90%