DEBT - Senior Unsecured Notes (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Premium, net	$ 15,216
Deferred financing costs	18,853
Senior Notes
Debt Instrument [Line Items]
Principal balance	1,300,000	$ 1,300,000
Premium, net	15,216	15,900
Deferred financing costs	8,374	9,600
Senior Notes \| 5.5% Senior Unsecured Notes due 2021
Debt Instrument [Line Items]
Principal balance	500,000	500,000
Senior Notes \| 5.375% Senior Unsecured Notes due 2023
Debt Instrument [Line Items]
Principal balance	200,000	200,000
Senior Notes \| 5.125% Senior Unsecured Notes due 2026
Debt Instrument [Line Items]
Principal balance	500,000	500,000
Senior Notes \| 5.38% Senior Unsecured Notes due 2027
Debt Instrument [Line Items]
Principal balance	$ 100,000	$ 100,000

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Amount, after accumulated amortization, of debt discount (premium).

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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