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DEBT - Senior Unsecured Notes (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Aug. 17, 2017	Jan. 23, 2014	May 23, 2013
Debt Instrument [Line Items]
Principal Balance	$ 1,300,000,000	$ 1,300,000,000
Deferred financing costs, net	15,661,000
5.5% Senior Unsecured Notes due 2021
Debt Instrument [Line Items]
Principal Balance	$ 500,000,000	500,000,000
Interest rate	5.50%			5.50%
5.375% Senior Unsecured Notes Due 2023
Debt Instrument [Line Items]
Principal Balance	$ 200,000,000	200,000,000
Interest rate	5.375%				5.375%
Senior Unsecured Notes Due 2026
Debt Instrument [Line Items]
Principal Balance	$ 500,000,000	500,000,000
Interest rate	5.125%		5.125%
Senior Unsecured Notes Due 2027
Debt Instrument [Line Items]
Principal Balance	$ 100,000,000	100,000,000
Interest rate	5.38%		5.38%
Senior Notes
Debt Instrument [Line Items]
Premium, net	$ 14,500,000	15,900,000
Deferred financing costs, net	$ 7,106,000	$ 9,600,000