DEBT - 2021 Notes (Details) - USD ($)	Feb. 11, 2014	Dec. 31, 2018
Debt Instrument [Line Items]
Unamortized discount		$ 11,769,000
2021 Notes Indenture
Debt Instrument [Line Items]
Aggregate principal debt amount	$ 200,000,000.0
Stated interest rate	8.875%	8.875%
Unamortized discount	$ 5,000,000
Proceeds from issuance of long-term debt	$ 194,500,000

Face (par) amount of debt instrument at time of issuance.

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

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Amount, after accumulated amortization, of debt discount.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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