ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loyalty Program Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Movement in Deferred Revenue [Roll Forward]
Loyalty program deferred revenue, beginning balance	$ 8,073	$ 9,703
Loyalty points forfeited	(6,963)	(8,801)
Loyalty points used	(15,451)	(15,077)
Loyalty points vested	20,085	20,403
Loyalty points unvested	1,289	1,845
Loyalty program deferred revenue, ending balance	$ 7,033	$ 8,073

Value of deferred revenue or cost to provide products or services, which is expected to be recognized in income or incurred within one year or the normal operating cycle, if longer, resulting from customer loyalty program. Excludes liability associated with frequent flier programs. Includes liability associated with customer loyalty programs for other businesses, for example, but is not limited to, hotels, supermarkets, credit card companies, automobile rental companies, and book sellers.

No definition available.

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