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LONG-TERM DEBT - Components (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Apr. 24, 2017
Principal
Aggregate maturities of long-term debt	$ 789,280	$ 667,000
Less current maturities	(13,157)	(92,000)
Total long-term debt	776,123	575,000
Unamortized Discount and Debt Issuance Costs
Unamortized debt issuance costs including current and non-current	(7,929)	(10,996)
Total unamortized debt issuance costs	(7,929)	(10,996)
Revolving credit facility
Principal
Aggregate maturities of long-term debt	255,000	175,000
Unamortized Discount and Debt Issuance Costs
Unamortized debt issuance costs including current and non-current	(3,050)	(5,203)
Senior notes due 2025
Principal
Aggregate maturities of long-term debt	400,000	400,000
Unamortized Discount and Debt Issuance Costs
Unamortized debt issuance costs including current and non-current	(4,879)	(5,793)	$ (7,300)
Securitization Facility
Principal
Aggregate maturities of long-term debt	73,800	$ 92,000
Equipment Financing May 2019
Principal
Aggregate maturities of long-term debt	8,199
Equipment Financing November 2019
Principal
Aggregate maturities of long-term debt	$ 52,281

X

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Amount, after accumulated amortization, of unamortized debt discount (premium) and debt issuance costs classified as noncurrent.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt scheduled to be repaid within one year or the normal operating cycle, if longer.

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Amount of long-term debt, before unamortized (discount) premium and debt issuance costs, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities).

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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