LEGAL PROCEEDINGS (Details) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended								12 Months Ended
	Oct. 08, 2015	May 21, 2015	Aug. 31, 2015	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Litigation expenses				$ (645)	$ (12,056)	$ (44,827)	$ (2,123)	$ (3,331)	$ (1,342)	$ (396)	$ (1,505)	$ (59,651)	$ (6,574)
Settled Litigation | Qui Tam Action, Government Entities
Loss Contingencies [Line Items]
Loss Contingency Accrual, Payments	$ 26,750
Settled Litigation | Qui Tam Action, Relator
Loss Contingencies [Line Items]
Loss Contingency Accrual, Payments	$ 1,750
Settled Litigation | Junk Fax Lawsuit
Loss Contingencies [Line Items]
Loss Contingency Accrual, Payments			$ 15,200	$ 13,000
Litigation Settlement, Amount		$ 45,000
Period During Which Pay Class Members May Submit Valid Claim Form		90 days
Selling, general and administrative expenses | Settled Litigation | Qui Tam Action
Loss Contingencies [Line Items]
Litigation expenses												(28,500)
Selling, general and administrative expenses | Settled Litigation | Junk Fax Lawsuit
Loss Contingencies [Line Items]
Litigation expenses												$ (28,200)