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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Additional Paid-in Capital
Adjustments due to adoption of new accounting standard
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Accumulated Earnings
Accumulated Earnings
Adjustments due to adoption of new accounting standard
Noncontrolling Interest
Balance, beginning of period, shares at Dec. 31, 2019   32,891,000              
Balance, beginning of period at Dec. 31, 2019 $ 396,662 $ 696 $ 454,663   $ (867,817) $ (39,503) $ 848,623    
Net income 58,711           58,711    
Unrealized gain on short-term investments, net of tax (3)         (3)      
Foreign currency translation adjustments 8,368         8,368      
Total comprehensive income, net of tax 67,076                
Repurchase of common stock (38,168)   (11,859)   (26,309)        
Repurchase of common stock, shares   (878,000)              
Issuance of common stock pursuant to employee stock purchase plan 2,523   2,523            
Issuance of common stock pursuant to employee stock purchase plan, shares   68,000              
Issuance of restricted common stock pursuant to stock-based compensation plans   $ 7 (7)            
Issuance of restricted common stock pursuant to stock-based compensation plans, shares   672,000              
Cancellation of restricted common stock issued pursuant to stock-based compensation plans (3) $ (3)              
Cancellation of restricted common stock issued pursuant to stock-based compensation plans, shares   (40,000)              
Stock-based compensation expense 25,237   25,237            
Dividends (30,932)           (30,932)    
Balance, ending of period, shares at Dec. 31, 2020   32,713,000              
Balance, ending of period at Dec. 31, 2020 422,395 $ 700 470,557   (894,126) (31,138) 876,402    
Net income 72,331           72,331    
Unrealized gain on short-term investments, net of tax (19)         (19)      
Foreign currency translation adjustments (7,196)         (7,196)      
Total comprehensive income, net of tax 65,116                
Repurchase of common stock (42,238)   (6,258)   (35,980)        
Repurchase of common stock, shares   (863,000)              
Issuance of common stock pursuant to employee stock purchase plan 2,610   2,610            
Issuance of common stock pursuant to employee stock purchase plan, shares   64,000              
Issuance of restricted common stock pursuant to stock-based compensation plans   $ 6 (6)            
Issuance of restricted common stock pursuant to stock-based compensation plans, shares   661,000              
Cancellation of restricted common stock issued pursuant to stock-based compensation plans (1) $ (1)              
Cancellation of restricted common stock issued pursuant to stock-based compensation plans, shares   (80,000)              
Stock-based compensation expense 21,400   21,400            
Dividends (32,673)           (32,673)    
Noncontrolling interest related to business combination $ 3,635               $ 3,635
Balance, ending of period, shares at Dec. 31, 2021 32,495,000 32,495,000              
Balance, ending of period at Dec. 31, 2021 $ 440,244 $ 705 488,303   (930,106) (38,353) 916,060   3,635
Net income 44,060           44,060    
Unrealized gain on short-term investments, net of tax 7         (7)      
Foreign currency translation adjustments (20,483)         (20,483)      
Total comprehensive income, net of tax 23,584                
Repurchase of common stock (96,604) $ 1 (8,675)   (87,928)        
Repurchase of common stock, shares   (1,635,000)              
Issuance of common stock pursuant to employee stock purchase plan 2,969   2,969            
Issuance of common stock pursuant to employee stock purchase plan, shares   57,000              
Issuance of restricted common stock pursuant to stock-based compensation plans   $ 6 (6)            
Issuance of restricted common stock pursuant to stock-based compensation plans, shares   544,000              
Cancellation of restricted common stock issued pursuant to stock-based compensation plans   $ (2) 2            
Cancellation of restricted common stock issued pursuant to stock-based compensation plans, shares   (192,000)              
Stock-based compensation expense 27,243   27,243            
Settlement of convertible debt securities, net of tax (4,845)   (4,845)            
Dividends (33,707)           (33,707)    
Write-off of noncontrolling interest $ (3,635)               (3,635)
Balance, ending of period, shares at Dec. 31, 2022 31,269,000 31,269,000              
Balance, ending of period at Dec. 31, 2022 $ 355,249 $ 708 $ 495,189 $ (9,802) $ (1,018,034) $ (58,829) $ 936,215 $ 9,802 $ 0