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DEBT - Senior Unsecured Notes (Details) - USD ($)	Jun. 30, 2019	May 29, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Premium, net	$ 13,980,000
Deferred financing costs	14,921,000
Senior Notes
Debt Instrument [Line Items]
Principal balance	1,100,000,000		$ 1,300,000,000
Premium, net	13,980,000		14,500,000
Deferred financing costs	7,462,000		7,100,000
Senior Notes \| 5.5% Senior Unsecured Notes due 2021
Debt Instrument [Line Items]
Principal balance	$ 0		500,000,000
Interest rate	5.50%
Senior Notes \| 5.375% Senior Unsecured Notes due 2023
Debt Instrument [Line Items]
Principal balance	$ 200,000,000		200,000,000
Interest rate	5.375%
Senior Notes \| 4.80% Senior Unsecured Notes Due 2024
Debt Instrument [Line Items]
Principal balance	$ 300,000,000		0
Interest rate	4.80%	4.80%
Senior Notes \| 5.125% Senior Unsecured Notes due 2026
Debt Instrument [Line Items]
Principal balance	$ 500,000,000		500,000,000
Interest rate	5.125%
Senior Notes \| 5.38% Senior Unsecured Notes due 2027
Debt Instrument [Line Items]
Principal balance	$ 100,000,000		$ 100,000,000
Interest rate	5.38%