BUSINESS COMBINATIONS (Details) (USD $)	3 Months Ended		6 Months Ended			0 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Mar. 07, 2013 IDT [Member] Employee	Dec. 20, 2012 Ozmo Inc. Employee	Dec. 31, 2012 Ozmo Inc.
Purchase price allocation as of the closing date of acquisition
Payments to Acquire Businesses, Gross						$ 10,300,000	$ 64,400,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill						(3,500,000)	(15,400,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles						(1,400,000)	(2,800,000)
Goodwill	104,501,000		104,501,000		104,430,000	5,400,000	46,200,000
Business Combination, Acquisition Related Costs	1,759,000	1,956,000	4,014,000	3,912,000		100,000		200,000
Business Combination, Number of Employees of Acquired, Employee						20	50
Goodwill, Subsequent Recognition of Deferred Tax Asset							11,200,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High							22,000,000
Business Combination, Contingent Consideration, Liability								$ 1,900,000
Business Combination, Contingent Consideration, Valuation Assumption, Expected Rate of Return							17.00%