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LONG-TERM DEBT (Details) - USD ($) $ in Thousands	Feb. 15, 2018	Dec. 31, 2018	Dec. 31, 2017	Oct. 10, 2017	Oct. 07, 2017	Sep. 07, 2017	Jul. 10, 2017	Feb. 16, 2017	Sep. 09, 2016	Jun. 09, 2016	Dec. 21, 2015	May 01, 2015
Current and long-term debt
Principal amount outstanding, net		$ 613,105	$ 409,168						$ 1,016,160
Predecessor
Current and long-term debt
Principal amount outstanding, net									$ 1,031,114
Interest rate (as a percent)										13.00%
8.625% senior secured second lien notes due 2020
Current and long-term debt
Interest rate (as a percent)								8.625%
8.625% senior secured second lien notes due 2020 | Predecessor
Current and long-term debt
Interest rate (as a percent)												8.625%
Principal amount												$ 700,000
12.0% senior secured second lien notes due 2022
Current and long-term debt
Interest rate (as a percent)					12.00%
12.0% senior secured second lien notes due 2022 | Predecessor
Current and long-term debt
Interest rate (as a percent)											12.00%
Principal amount											$ 112,800
6.75% senior notes due 2025
Current and long-term debt
Principal amount outstanding, net		$ 613,105	$ 409,168
Interest rate (as a percent)		6.75%	6.75%				6.75%	6.75%
Unamortized discount		$ 7,200	$ 8,100
Principal amount		625,005	425,005			$ 850,000	$ 850,000	$ 850,000
Principal amount repurchased				$ 425,000
Additional 2025 Notes
Current and long-term debt
Principal amount	$ 200,000
Unamortized debt issuance costs		10,100	7,700
Issue price as a percentage of par value	103.00%
Unamortized premium related to debt issued		5,400
Senior revolving credit facility
Current and long-term debt
Unamortized debt issuance costs		$ 11,100	$ 8,300

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Face (par) amount of the original debt instrument that was repurchased.

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Amount, after accumulated amortization, of debt discount.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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