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SHAREHOLDERS' EQUITY (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Feb. 20, 2019
Feb. 21, 2018
May 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Annual interest rate on convertible senior notes         0.625%
Calculation of weighted average common shares          
Weighted average common shares, basic 12,957,000 12,718,000      
Effect of dilutive securities          
Effect of stock options (in shares) 628,000 686,000      
Effect of dilutive share awards (in shares) 104,000 161,000      
Effect of Convertible Senior Notes (in shares) 469,000 621,000      
Weighted average common shares, diluted 14,158,000 14,186,000      
Common stock repurchases          
Value of common stock authorized to be repurchased     $ 150,000 $ 100,000  
Purchase of treasury stock (in shares)   17,501      
Treasury Stock, Value, Acquired, Cost Method   $ 3,976      
Remaining authorized repurchase amount $ 179,700        
Share-based Payment Arrangement, Option [Member]          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 100,000 400,000