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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

LONG-TERM DEBT - Debt Refinancing (Details) - USD ($) $ in Millions		6 Months Ended
	Jul. 16, 2018	Jul. 01, 2018	Dec. 31, 2017
9.00% senior secured notes due in 2022
LONG-TERM DEBT
Interest rate (as a percent)		9.00%	9.00%
Amount of debt redeemed		$ 75.0
Forecast \| 9.00% senior secured notes due in 2022
LONG-TERM DEBT
Amount of debt redeemed	$ 344.1
Forecast \| 9.00% senior secured notes due in 2026
LONG-TERM DEBT
Aggregate principal amount of notes issued	$ 310.0
Interest rate (as a percent)	9.00%