BUSINESS COMBINATIONS - Narrative (Details) - USD ($) $ in Thousands	Jan. 13, 2015	Mar. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill		$ 229,157	$ 229,157
RazorInsights
Business Acquisition [Line Items]
Payments to acquire businesses, gross	$ 39,900
Measurement period adjustments	(1,000)
Fair value of assets acquired	8,900
Goodwill	31,100
Transaction costs associated with the acquisition	300
RazorInsights | Technology-Based Intangible Assets
Business Acquisition [Line Items]
Intangible assets acquired	7,000
RazorInsights | Customer Relationships
Business Acquisition [Line Items]
Intangible assets acquired	$ 4,000