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DEBT (Details) - USD ($) $ in Thousands	Feb. 16, 2017	Jul. 10, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 28, 2016	Sep. 09, 2016
Current and long-term debt
Principal amount outstanding, net			$ 1,093,548	$ 964,653		$ 1,016,160
8.625% senior secured second lien notes due 2020
Current and long-term debt
Principal amount outstanding, net				$ 672,613
Interest rate (as a percent)			8.625%	8.625%
Unamortized discount				$ 27,400
12.0% senior secured second lien notes due 2022
Current and long-term debt
Principal amount outstanding, net			$ 106,521	$ 106,040
Interest rate (as a percent)		12.00%	12.00%	12.00%
Unamortized discount			$ 6,300	$ 6,800	$ 1,400
6.75% senior unsecured notes due 2025
Current and long-term debt
Principal amount outstanding, net			$ 834,027
Interest rate (as a percent)	6.75%		6.75%
Outstanding 8.625% notes repurchased with proceeds from the 6.75% note offering (as a percent)	41.00%
Unamortized debt issuance costs			$ 16,000
Senior revolving credit facility
Current and long-term debt
Principal amount outstanding, net			$ 153,000	$ 186,000

X

- Definition

Represents the percentage of outstanding notes repurchased with proceeds from the 6.75% note offering.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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.

+ References

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-Section S99
-Paragraph 1
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