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STOCK-BASED COMPENSATION (Schedule of Changes in Options Outstanding) (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Number of Options  
Balance | shares 179,159
Granted | shares
Exercised | shares (50,473)
Expired | shares (7,722)
Forfeited | shares (881)
Balance | shares 120,083
Vested and expected to vest | shares 120,083
Exercisable | shares 120,083
Weighted Average Exercise Price  
Balance | $ / shares $ 16.27
Granted | $ / shares
Exercised | $ / shares 19.07
Expired | $ / shares 26.90
Forfeited | $ / shares 15.62
Balance | $ / shares 14.41
Vested and expected to vest | $ / shares 14.41
Exercisable | $ / shares $ 14.41
Weighted Average Remaining Contractual Term  
Balance 3 years 4 months 17 days
Vested and Expected to Vest 3 years 4 months 17 days
Exercisable 3 years 4 months 17 days
Aggregate Intrinsic Value  
Balance | $ $ 2,475
Vested and expected to vest | $ 2,475
Exercisable | $ $ 2,475