DEBT - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 17, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total long-term debt	$ 707,500		$ 661,082
Senior Notes	300,000		0
Less: Convertible Notes debt discount, net	(25,023)		(30,125)
Less: current maturities of long-term debt	(5,000)		(8,750)
Less: Term Loan deferred financing costs, net	(570)		(456)
Total long-term debt, less current maturities, net	670,928		621,751
Line of Credit
Debt Instrument [Line Items]
Total long-term debt	135,000		392,332
Term Loan
Debt Instrument [Line Items]
Total long-term debt	100,000		96,250
Convertible Debt
Debt Instrument [Line Items]
Total long-term debt	172,500		172,500
7.50% Senior Notes Due 2027 \| Senior Notes
Debt Instrument [Line Items]
Debt Issuance Costs, Gross	$ (5,979)	$ (6,000)	$ 0

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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