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EQUITY INSTRUMENTS (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Compensation expense on issuance of restricted stock and restricted stock units $ 9,319 $ 5,198 $ 4,312
Total unrecognized compensation expense related to unvested share-based compensation arrangements $ 7,664    
Period over which unvested share-based compensation is expected to be recognized, weighted average (in Duration) 1 year    
Board of Directors Compensation [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Common stock issued for services (in Shares) 14,000 27,000 22,000
Common stock issued for services, costs recognized $ 700 $ 700 $ 509
Non-Employee Services [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Common stock issued for services (in Shares) 1,000 0 0
Common stock issued for services, costs recognized $ 20    
Maximum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Award expiration period (in Duration) 10 years    
Award vesting period (in Duration) 4 years    
Minimum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Award vesting period (in Duration) 2 years    
Stock Option [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Award expiration period (in Duration) 7 years    
Compensation expense for stock option awards $ 884 $ 1,072 $ 647
Weighted-average grant date fair value of stock options granted during the period (in Dollars per Share)   $ 5.99 $ 5.18
Stock options exercised during the period, total intrinsic value $ 8,660 $ 5,727 $ 5,520
Stock options, granted 0 140,000 194,000
Restricted Stock [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of shares expected to vest (in Shares) 228,000    
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 [Member] | Minimum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Award vesting period (in Duration) 2 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) 227,000    
1999 Equity Incentive Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares authorized under an equity incentive plan (in Shares) 1,000,000    
Awards exercisable after 10 years from date award is granted (in Shares) 0    
2000 Equity Incentive Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares authorized under an equity incentive plan (in Shares) 5,600,000    
Awards exercisable after 10 years from date award is granted (in Shares) 0    
Second Amended and Restated 2008 Long Term Incentive Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares authorized under an equity incentive plan (in Shares) 7,400,000    
Shares available for grant (in Shares) 2,898,000    
Awards exercisable after 10 years from date award is granted (in Shares) 0