Contractual interest rate for funds borrowed, under the debt agreement.

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DEBT - Senior Unsecured Notes (Details) - USD ($)	Dec. 31, 2017	Aug. 17, 2017	Dec. 31, 2016	Jan. 23, 2014	May 23, 2013
Debt Instrument [Line Items]
Principal Balance	$ 1,300,000,000		$ 700,000,000
Deferred financing costs, net	21,214,000
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		0
Interest rate	5.125%	5.125%
Senior Unsecured Notes Due 2027
Debt Instrument [Line Items]
Principal Balance	$ 100,000,000		0
Interest rate	5.38%	5.38%
Senior Notes
Debt Instrument [Line Items]
Premium, net	$ 15,900,000
Deferred financing costs, net	$ 9,629,000		11,200,000
Discount, net			$ 500,000