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SHARE-BASED COMPENSATION EXPENSE (Narrative) (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Compensation expense on issuance of restricted stock and restricted stock units $ 2,253 $ 2,421 $ 6,499 $ 6,520
Total unrecognized compensation expense related to unvested share-based compensation arrangements 11,102   $ 11,102  
Period over which unvested share-based compensation is expected to be recognized, weighted average (in Duration)     1 year  
Stock Option [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Compensation expense for stock option awards 65 204 $ 246 679
Stock options exercised during the period, total intrinsic value $ 336 $ 2,847 $ 2,615 $ 8,269
Restricted Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of shares expected to vest (in Shares) 228   228  
Restricted Stock [Member] | Minimum [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Award vesting period (in Duration)     2 years  
Restricted Stock [Member] | Maximum [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Award vesting period (in Duration)     4 years  
Restricted Stock Units [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Minimum percentage that restricted stock performance based units may increase over original award caused by achievement of goals (in Percent)     0.00%  
Maximum percentage that restricted stock performance based units may increase over original award caused by achievement of goals (in Percent)     200.00%  
Number of shares expected to vest (in Shares) 308   308