DEBT - 2021 Notes (Details) - USD ($)	Feb. 11, 2014	Dec. 31, 2017
Debt Instrument [Line Items]
Unamortized discount		$ 2,600,000
2021 Notes Indenture
Debt Instrument [Line Items]
Aggregate principal debt amount	$ 200,000,000.0
Stated interest rate	8.875%	8.875%
Unamortized discount	$ 5,000,000
Proceeds from issuance of long-term debt	194,500,000
Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of short-term debt	59,300,000
First Lien Note Facility
Debt Instrument [Line Items]
Repayments of long-term debt	$ 135,200,000

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

Reference 1: 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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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