BUSINESS COMBINATIONS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended							12 Months Ended				12 Months Ended
	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Minimum [Member]	Dec. 31, 2013 Maximum [Member]	Dec. 31, 2013 Customer Relationships [Member]	Dec. 31, 2012 Customer Relationships [Member]	Dec. 31, 2012 Developed Technology Rights [Member] Minimum [Member]	Dec. 31, 2012 Developed Technology Rights [Member] Maximum [Member]	Dec. 31, 2013 Noncompete Agreements [Member]	Dec. 31, 2012 Noncompete Agreements [Member]	Dec. 31, 2012 Noncompete Agreements [Member] Minimum [Member]	Dec. 31, 2012 Noncompete Agreements [Member] Maximum [Member]	Dec. 31, 2012 Ozmo Inc.	Dec. 20, 2012 Ozmo Inc.	Dec. 20, 2012 Ozmo Inc. Customer Relationships [Member]	Dec. 20, 2012 Ozmo Inc. Developed Technology Rights [Member]	Dec. 20, 2012 Ozmo Inc. Noncompete Agreements [Member]
Business Combination, Consideration Transferred [Abstract]
Business Combination, Consideration Transferred, Shareholders' Equity Interest															$ 58,165
Business Combination, Consideration Transferred, Acquired Entity Unvested Shares															237
Transaction costs incurred															1,816
Business Acquisition, Purchase Price Allocation, Liabilities Assumed															1,415
Eligible earnout amount based on achieving certain revenue targets and continuing employment															1,927
BusinessCombinationRecognizedIdentifiableLiabilitiesAssumed															861
Payments to Acquire Businesses, Gross	15,600														64,421
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Payments to Acquire Businesses, Gross	15,600														64,421
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets																2,805
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets																15,450	2,650	12,020	780
Goodwill		108,240	104,430	67,662												46,166
Components of the identifiable intangible assets subject to amortization
Gross Value							25,857	24,657			3,794	3,595
Total intangible assets, net		(28,116)	(27,257)
Estimated Useful Life (in years)					3 years	5 years			4 years	6 years			1 year	3 years
Components of acquisition-related charges
Total acquisition-related charges		$ 5,534	$ 7,388	$ 5,408