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INCOME TAXES (Schedule of Reconciliation of Effective Income Tax Rate and Federal Statutory Rate) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of effective income tax rate and the federal statutory rate      
Federal tax (benefit) at statutory rate $ (8,680) $ (10,026) $ (7,133)
State tax (benefit)/expense, net of federal income tax benefit 628 (360)
Stock compensation expense $ 508 745 574
Effect of differences in foreign tax rates (2,723) 7,772 (28,969)
FIN48 Tax reserve $ (7,433) $ 618 (2,025)
Effect of tax rate changes on deferred taxes 2,407
Change in deferred tax valuation allowance $ 13,161 $ 1,824 38,234
Tax credits (535) (552)
Other $ 1,005 592 175
Total $ (4,162) $ 1,618 $ 2,351