LONG-TERM DEBT - Collateral and Guarantees (Narrative) (Details)	12 Months Ended
Dec. 31, 2017
Senior secured credit facilities
Line of Credit Facility [Line Items]
Capital stock used to secure obligations under senior secured credit facilities (as a percent)	100.00%

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.

No definition available.

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration