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LONG-TERM DEBT - 2025 Senior Notes (Details) - USD ($) $ in Thousands		12 Months Ended
	Apr. 24, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Issuance of Senior Notes
Make-whole payment		$ 8,148
Discount and debt issuance costs incurred			$ 7,929	$ 10,996
Senior notes due 2025
Issuance of Senior Notes
Principal amount	$ 400,000
Term	8 years
Interest rate (as a percent)	7.50%
Percentage of debt that may be redeemed prior to May 1, 2020	35.00%
Redemption price expressed as a percentage of principal	107.50%
Make-whole payment	$ 8,100
Discount and debt issuance costs incurred	$ 7,300		$ 4,879	$ 5,793

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The percentage of debt that may be redeemed prior to date specified in the debt indenture.

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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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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

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