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EQUITY INSTRUMENTS (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Compensation expense on issuance of restricted stock and restricted stock units   $ 5,198,000 $ 4,312,000 $ 4,740,000
Recognized decrease/(increase) in taxes payable from the exercise of certain stock options and restricted stock   2,936,000 $ 2,750,000 $ (68,000)
Total unrecognized compensation expense related to unvested share-based compensation arrangements $ 7,629,000 $ 7,629,000    
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)   27,000 22,000 27,000
Common stock issued for services, costs recognized   $ 700,000 $ 509,000 $ 455,000
Non-Employee Services [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Common stock issued for services (in Shares)   0 0 2,000
Common stock issued for services, costs recognized   $ 0 $ 0 $ 30,000
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   $ 1,072,000 $ 647,000 $ 426,000
Weighted-average grant date fair value of stock options granted during the period (in Dollars per Share)   $ 5.99 $ 5.18 $ 3.88
Stock options exercised during the period, total intrinsic value   $ 5,727,000 $ 5,520,000 $ 219,000
Restricted Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of shares expected to vest (in Shares) 207,000 207,000    
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 units, vested but not certified 26,000      
Number of shares expected to vest (in Shares) 274,000 274,000    
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 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 5,600,000    
Awards exercisable after 10 years from date award is granted (in Shares)   0    
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) 5,400,000 5,400,000    
Shares available for grant (in Shares) 1,047,000 1,047,000    
Awards exercisable after 10 years from date award is granted (in Shares)   0