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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Adjustment to adopt credit-loss guidance
 [1]
Balance, January 1, 2020
Common Stock
Common Stock
Balance, January 1, 2020
Additional Paid-in Capital
Additional Paid-in Capital
Balance, January 1, 2020
Accumulated Other Comprehensive Income, net of taxes
Accumulated Other Comprehensive Income, net of taxes
Balance, January 1, 2020
Retained Earnings
Retained Earnings
Adjustment to adopt credit-loss guidance
 [1]
Retained Earnings
Balance, January 1, 2020
Treasury Stock
Treasury Stock
Balance, January 1, 2020
Balance (in shares) at Dec. 31, 2018       75,344,000                    
Beginning balance at Dec. 31, 2018 $ 440,780     $ 753   $ 259,440   $ 158   $ 190,092     $ (9,663)  
Comprehensive income:                            
Net income for the period 9,156                 9,156        
Unrealized loss on available-for-sale marketable securities, net of taxes 1,416             1,416            
Comprehensive income for the period 10,572                          
Exercise of stock options and other share-based compensation, net of shares tendered for payment (in shares)       115,000                    
Exercise of stock options and other share-based compensation, net of shares tendered for payment 1,913     $ 2   1,911                
Payment of statutory withholding on issuance of restricted stock and restricted stock units (579)         (579)                
Share-based compensation expense — stock options, restricted stock and restricted stock units 1,656         1,656                
Treasury shares issued for Deferred Compensation Plan funding and redemptions 536         535             1  
Shares issued pursuant to Employee Stock Plan 2,130         1,781             349  
Dividends paid and accrued, $0.20 per share (14,656)                 (14,656)        
Shares issued pursuant to Dividend Reinvestment Plan 23         18             5  
Other (in shares)       6,000                    
Other 174         174                
Balance (in shares) at Mar. 31, 2019       75,465,000                    
Ending balance at Mar. 31, 2019 $ 442,549     $ 755   264,936   1,574   184,592     (9,308)  
Comprehensive income:                            
Cash dividend paid per common share (in dollars per share) $ 0.20                          
Balance (in shares) at Dec. 31, 2018       75,344,000                    
Beginning balance at Dec. 31, 2018 $ 440,780     $ 753   259,440   158   190,092     (9,663)  
Comprehensive income:                            
Net income for the period 45,686                          
Unrealized loss on available-for-sale marketable securities, net of taxes 2,664                          
Comprehensive income for the period 48,350                          
Balance (in shares) at Sep. 30, 2019       75,524,000                    
Ending balance at Sep. 30, 2019 455,299     $ 755   269,598   2,822   191,515     (9,391)  
Balance (in shares) at Dec. 31, 2018       75,344,000                    
Beginning balance at Dec. 31, 2018 440,780     $ 753   259,440   158   190,092     (9,663)  
Balance (in shares) at Dec. 31, 2019       75,557,000 75,557,000                  
Ending balance at Dec. 31, 2019 $ 460,305 $ (32,099) $ 428,206 $ 756 $ 756 270,614 $ 270,614 2,919 $ 2,919 195,455 $ (32,099) $ 163,356 (9,439) $ (9,439)
Comprehensive income:                            
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member                          
Balance (in shares) at Mar. 31, 2019       75,465,000                    
Beginning balance at Mar. 31, 2019 $ 442,549     $ 755   264,936   1,574   184,592     (9,308)  
Comprehensive income:                            
Net income for the period 18,186                 18,186        
Unrealized loss on available-for-sale marketable securities, net of taxes 791             791            
Comprehensive income for the period 18,977                          
Exercise of stock options and other share-based compensation, net of shares tendered for payment (in shares)       54,000                    
Exercise of stock options and other share-based compensation, net of shares tendered for payment 1,186         1,186                
Share-based compensation expense — stock options, restricted stock and restricted stock units 1,668         1,668                
Treasury shares issued for Deferred Compensation Plan funding and redemptions (2)         45             (47)  
Dividends paid and accrued, $0.20 per share (14,753)                 (14,753)        
Shares issued pursuant to Dividend Reinvestment Plan 23         18             5  
Balance (in shares) at Jun. 30, 2019       75,519,000                    
Ending balance at Jun. 30, 2019 $ 449,648     $ 755   267,853   2,365   188,025     (9,350)  
Comprehensive income:                            
Cash dividend paid per common share (in dollars per share) $ 0.20                          
Net income for the period $ 18,344                 18,344        
Unrealized loss on available-for-sale marketable securities, net of taxes 457             457            
Comprehensive income for the period 18,801                          
Exercise of stock options and other share-based compensation, net of shares tendered for payment (in shares)       5,000                    
Exercise of stock options and other share-based compensation, net of shares tendered for payment 67         67                
Payment of statutory withholding on issuance of restricted stock and restricted stock units (8)         (8)                
Share-based compensation expense — stock options, restricted stock and restricted stock units 1,626         1,626                
Treasury shares issued for Deferred Compensation Plan funding and redemptions (2)         45             (47)  
Dividends paid and accrued, $0.20 per share (14,854)                 (14,854)        
Shares issued pursuant to Dividend Reinvestment Plan 21         15             6  
Balance (in shares) at Sep. 30, 2019       75,524,000                    
Ending balance at Sep. 30, 2019 $ 455,299     $ 755   269,598   2,822   191,515     (9,391)  
Comprehensive income:                            
Cash dividend paid per common share (in dollars per share) $ 0.20                          
Balance (in shares) at Dec. 31, 2019       75,557,000 75,557,000                  
Beginning balance at Dec. 31, 2019 $ 460,305 (32,099) 428,206 $ 756 $ 756 270,614 270,614 2,919 2,919 195,455 (32,099) 163,356 (9,439) (9,439)
Comprehensive income:                            
Net income for the period 20,190                 20,190        
Unrealized loss on available-for-sale marketable securities, net of taxes (533)             (533)            
Comprehensive income for the period 19,657                          
Exercise of stock options and other share-based compensation, net of shares tendered for payment (in shares)       162,000                    
Exercise of stock options and other share-based compensation, net of shares tendered for payment 1,724     $ 1   1,723                
Payment of statutory withholding on issuance of restricted stock and restricted stock units (661)         (661)                
Share-based compensation expense — stock options, restricted stock and restricted stock units 1,822         1,822                
Treasury shares issued for Deferred Compensation Plan funding and redemptions 528         417             111  
Shares issued pursuant to Employee Stock Plan 1,835         1,329             506  
Dividends paid and accrued, $0.20 per share (15,142)                 (15,142)        
Shares issued pursuant to Dividend Reinvestment Plan 23         16             7  
Other (in shares)       6,000                    
Other 187         187                
Balance (in shares) at Mar. 31, 2020       75,725,000                    
Ending balance at Mar. 31, 2020 $ 438,179     $ 757   275,447   2,386   168,404     (8,815)  
Comprehensive income:                            
Cash dividend paid per common share (in dollars per share) $ 0.20125                          
Balance (in shares) at Dec. 31, 2019       75,557,000 75,557,000                  
Beginning balance at Dec. 31, 2019 $ 460,305 $ (32,099) $ 428,206 $ 756 $ 756 270,614 $ 270,614 2,919 $ 2,919 195,455 $ (32,099) $ 163,356 (9,439) $ (9,439)
Comprehensive income:                            
Net income for the period 70,935                          
Unrealized loss on available-for-sale marketable securities, net of taxes 1,996                          
Comprehensive income for the period 72,931                          
Balance (in shares) at Sep. 30, 2020       75,734,000                    
Ending balance at Sep. 30, 2020 $ 464,750     $ 757   279,408   4,915   188,578     (8,908)  
Comprehensive income:                            
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member                          
Balance (in shares) at Mar. 31, 2020       75,725,000                    
Beginning balance at Mar. 31, 2020 $ 438,179     $ 757   275,447   2,386   168,404     (8,815)  
Comprehensive income:                            
Net income for the period 23,101                 23,101        
Unrealized loss on available-for-sale marketable securities, net of taxes 1,656             1,656            
Comprehensive income for the period 24,757                          
Exercise of stock options and other share-based compensation, net of shares tendered for payment (in shares)       7,000                    
Exercise of stock options and other share-based compensation, net of shares tendered for payment 138         138                
Share-based compensation expense — stock options, restricted stock and restricted stock units 1,830         1,830                
Treasury shares issued for Deferred Compensation Plan funding and redemptions (2)         51             (53)  
Dividends paid and accrued, $0.20 per share (15,237)                 (15,237)        
Shares issued pursuant to Dividend Reinvestment Plan 22         16             6  
Balance (in shares) at Jun. 30, 2020       75,732,000                    
Ending balance at Jun. 30, 2020 $ 449,687     $ 757   277,482   4,042   176,268     (8,862)  
Comprehensive income:                            
Cash dividend paid per common share (in dollars per share) $ 0.20250                          
Net income for the period $ 27,644                 27,644        
Unrealized loss on available-for-sale marketable securities, net of taxes 873             873            
Comprehensive income for the period 28,517                          
Exercise of stock options and other share-based compensation, net of shares tendered for payment (in shares)       2,000                    
Exercise of stock options and other share-based compensation, net of shares tendered for payment 31         31                
Payment of statutory withholding on issuance of restricted stock and restricted stock units (14)         (14)                
Share-based compensation expense — stock options, restricted stock and restricted stock units 1,840         1,840                
Treasury shares issued for Deferred Compensation Plan funding and redemptions (1)         53             (54)  
Dividends paid and accrued, $0.20 per share (15,334)                 (15,334)        
Shares issued pursuant to Dividend Reinvestment Plan 24         16             8  
Balance (in shares) at Sep. 30, 2020       75,734,000                    
Ending balance at Sep. 30, 2020 $ 464,750     $ 757   $ 279,408   $ 4,915   $ 188,578     $ (8,908)  
Comprehensive income:                            
Cash dividend paid per common share (in dollars per share) $ 0.20375                          
[1] See Note 4—Allowance for Doubtful Accounts regarding the new credit-loss guidance