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COMMITMENTS AND CONTINGENCIES (Schedule of Future Minimum Lease Payments Under All Non-cancelable Operating Leases With Initial Term In Excess of One Year) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leases        
2016 $ 1,663      
2017 $ 303      
2018      
2019      
2020      
Thereafter      
Future minimum lease payments $ 1,966      
Rent expense        
Rent expense 1,600 $ 1,800 $ 2,400  
Third Party Commissions        
Deferred revenue related to contracts covered by security agreements 0 11,700 10,200  
Deferred costs related to contracts covered by security agreements 0 5,700 5,300  
Letter of credit:        
Outstanding letters of credit 16,000      
Outstanding purchase commitments, including agreements that are non-cancelable and cancelable without penalty 32,500      
Uncertain Tax Positions        
Gross unrecognized tax benefits 22,694 45,382 45,430 $ 54,012
Unrecognized tax benefits that would impact the annual effective tax rate if recognized 6,000 $ 10,185 $ 9,999  
Unrecognized tax benefits if recognized, would impact certain deferred tax assets $ 16,700