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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2019   28,456,508      
Beginning balance at Dec. 31, 2019 $ 889,984 $ 28 $ 506,639 $ 383,191 $ 126
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 61,515     61,515  
Unrealized gain (loss) on investment, net of tax effect (310)       (310)
Adjustment to pension benefit plans, net of taxes (880)       (880)
Share-based compensation 3,393   3,553 (160)  
Issuance of restricted and deferred stock units (in shares)   68,347      
Issuance of restricted and deferred stock units $ (1,863) $ 1 (1,864)    
Employee stock purchase plan (in shares) 31,750 31,750      
Employee stock purchase plan $ 1,830   1,830    
Dividends paid (36,509)     (36,509)  
Ending balance (in shares) at Dec. 31, 2020   28,556,605      
Ending balance at Dec. 31, 2020 917,160 $ 29 510,158 408,037 (1,064)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 60,478     60,478  
Unrealized gain (loss) on investment, net of tax effect 185       185
Adjustment to pension benefit plans, net of taxes 716       716
Share-based compensation 4,128   4,246 (118)  
Issuance of restricted and deferred stock units (in shares)   49,824      
Issuance of restricted and deferred stock units $ (1,066)   (1,066)    
Employee stock purchase plan (in shares) 35,304 35,304      
Employee stock purchase plan $ 2,026   2,026    
Common stock issuance, net of costs (in shares)   1,539,615      
Common stock issuance, net of costs 91,029 $ 1 91,028    
Dividends paid $ (40,137)     (40,137)  
Ending balance (in shares) at Dec. 31, 2021 30,181,348 30,181,348      
Ending balance at Dec. 31, 2021 $ 1,034,519 $ 30 606,392 428,260 (163)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 73,828     73,828  
Unrealized gain (loss) on investment, net of tax effect (511)       (511)
Adjustment to pension benefit plans, net of taxes 2,151       2,151
Share-based compensation 4,641   4,791 (150)  
Issuance of restricted and deferred stock units (in shares)   54,243      
Issuance of restricted and deferred stock units $ (1,354)   (1,354)    
Employee stock purchase plan (in shares) 36,585 36,585      
Employee stock purchase plan $ 2,091   2,091    
Common stock issuance, net of costs (in shares)   529,736      
Common stock issuance, net of costs 39,085 $ 1 39,084    
Dividends paid $ (43,582)     (43,582)  
Ending balance (in shares) at Dec. 31, 2022 30,801,912 30,801,912      
Ending balance at Dec. 31, 2022 $ 1,110,868 $ 31 $ 651,004 $ 458,356 $ 1,477