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STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
May 31, 2017
May 31, 2010
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Dividend yield     0.00% 0.00% 0.00%
Share-based compensation expense recognized     $ 20,142 $ 27,725 $ 36,210
Intrinsic value, options exercised     1,800 4,000 11,100
Cash received from option exercises and employee stock purchase plan     4,300 5,500 6,800
Tax benefit realized from stock options exercised     $ 100 600 2,200
Shares available for purchase (in shares)     2,700,000    
Capitalized share-based compensation cost     $ 600 600 500
2003 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Increase in authorized shares (in shares) 1,700,000 3,500,000      
Common stock reserved for issuance (in shares)     14,700,000    
2000 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for issuance (in shares)     4,000,000    
2001 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for issuance (in shares)     4,000,000    
Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     4 years    
Share-based compensation expense recognized     $ 1,400 3,500 5,000
Total unrecognized compensation costs related to unvested awards     $ 3,800    
Weighted-average period for cost recognition, in years     3 years    
Employee Stock Option | Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     1 year    
Employee Stock Option | Employee          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period, in years     8 years    
Employee Stock Option | Directors and Certain Executive Officers | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period, in years     6 years    
Employee Stock Option | Directors and Certain Executive Officers | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period, in years     10 years    
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     3 years    
Restricted Stock, Performance Stock and Contract Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense recognized     $ 18,700 24,300 31,200
Total unrecognized compensation costs related to unvested awards     $ 30,500    
Weighted-average period for cost recognition, in years     2 years    
Fair value of shares vested     $ 18,200 $ 65,000 $ 15,700
Requisite service periods of performance stock, restricted stock and contract stock awards, in years     3 years    
Performance Shares Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vested or expected to vest at end of year (in shares)     51,241    
Employee Stock Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for issuance (in shares)     3,000,000    
Shares available for purchase (in shares)     1,900,000    
Shares issued (in shares)     23,337 20,780 16,948
ESPP proceeds received     $ 1,000 $ 1,100 $ 1,100