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Consolidated Statements of Changes in Shareholders' Equity - (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2020   31,779,663      
Beginning balance at Dec. 31, 2020 $ 1,240,892 $ 315 $ 427,016 $ 798,061 $ 15,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income 135,071     135,071  
Other comprehensive loss, net of tax (17,816)       (17,816)
Stock-based compensation expense 5,814   5,814    
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares)   (23,755)      
Vesting of time-based stock awards issued at date of grant, net of shares withheld for payroll taxes 0 $ 1 (1)    
Vesting of performance-based stock awards, net of shares withheld for payroll taxes (in shares)   15,686      
Time based stock awards granted (in shares)   179,172      
Issuance of common stock related to employee stock purchase plan (in shares)   9,767      
Issuance of common stock related to employee stock purchase plan 327   327    
Cash dividends declared (31,914)     (31,914)  
Common stock repurchased (in shares)   (13,075)      
Common stock repurchased (677)   (677)    
Ending balance (in shares) at Sep. 30, 2021   31,947,458      
Ending balance at Sep. 30, 2021 1,331,697 $ 316 432,479 901,218 (2,316)
Beginning balance (in shares) at Jun. 30, 2021   31,961,573      
Beginning balance at Jun. 30, 2021 1,306,336 $ 316 431,103 870,397 4,520
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income 43,609     43,609  
Other comprehensive loss, net of tax (6,836)       (6,836)
Stock-based compensation expense 1,990   1,990    
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares)   2,756      
Vesting of time-based stock awards issued at date of grant, net of shares withheld for payroll taxes 0        
Time based stock awards granted (in shares)   250      
Issuance of common stock related to employee stock purchase plan (in shares)   0      
Issuance of common stock related to employee stock purchase plan 0   0    
Cash dividends declared (12,788)     (12,788)  
Common stock repurchased (in shares)   (11,609)      
Common stock repurchased (615)   (615)    
Ending balance (in shares) at Sep. 30, 2021   31,947,458      
Ending balance at Sep. 30, 2021 $ 1,331,697 $ 316 432,479 901,218 (2,316)
Beginning balance (in shares) at Dec. 31, 2021 31,950,092 31,950,092      
Beginning balance at Dec. 31, 2021 $ 1,350,775 $ 316 434,640 930,061 (14,242)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income 98,737     98,737  
Other comprehensive loss, net of tax (196,397)       (196,397)
Stock-based compensation expense 7,587   7,587    
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares)   3,289      
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes 97   97    
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares)   68,931      
Vesting of time-based stock awards issued at date of grant, net of shares withheld for payroll taxes 0 $ 2 (2)    
Vesting of performance-based stock awards, net of shares withheld for payroll taxes (in shares)   21,026      
Time based stock awards granted (in shares)   166,471      
Issuance of common stock related to employee stock purchase plan (in shares)   10,374      
Issuance of common stock related to employee stock purchase plan 558   558    
Cash dividends declared (41,586)     (41,586)  
Common stock repurchased (in shares)   0      
Common stock repurchased $ 0   0    
Ending balance (in shares) at Sep. 30, 2022 32,082,321 32,082,321      
Ending balance at Sep. 30, 2022 $ 1,219,771 $ 318 442,880 987,212 (210,639)
Beginning balance (in shares) at Jun. 30, 2022   32,081,241      
Beginning balance at Jun. 30, 2022 1,252,720 $ 318 440,418 964,353 (152,369)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income 37,297     37,297  
Other comprehensive loss, net of tax (58,270)       (58,270)
Stock-based compensation expense 2,274   2,274    
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes (in shares)   0      
Issuance of common stock related to options exercised, net of shares withheld for payroll taxes 0   0    
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares)   2,893      
Vesting of time-based stock awards issued at date of grant, net of shares withheld for payroll taxes 0        
Time based stock awards granted (in shares)   0      
Issuance of common stock related to employee stock purchase plan (in shares)   3,973      
Issuance of common stock related to employee stock purchase plan 188   188    
Cash dividends declared $ (14,438)     (14,438)  
Ending balance (in shares) at Sep. 30, 2022 32,082,321 32,082,321      
Ending balance at Sep. 30, 2022 $ 1,219,771 $ 318 $ 442,880 $ 987,212 $ (210,639)