DEBT - Senior Unsecured Notes (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Premium, net	$ 14,135,000
Deferred financing costs	$ 14,484,000
5.5% Senior Unsecured Notes due 2021
Debt Instrument [Line Items]
Interest rate	5.50%
5.375% Senior Unsecured Notes due 2023
Debt Instrument [Line Items]
Interest rate	5.375%
5.125% Senior Unsecured Notes due 2026
Debt Instrument [Line Items]
Interest rate	5.125%
5.38% Senior Unsecured Notes due 2027
Debt Instrument [Line Items]
Interest rate	5.38%
Senior Notes
Debt Instrument [Line Items]
Principal balance	$ 1,300,000,000	$ 1,300,000,000
Premium, net	14,135,000	14,500,000
Deferred financing costs	6,477,000	7,100,000
Senior Notes \| 5.5% Senior Unsecured Notes due 2021
Debt Instrument [Line Items]
Principal balance	$ 500,000,000	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 \| 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%

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

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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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