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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2020   28,556,605      
Beginning balance at Dec. 31, 2020 $ 917,160 $ 29 $ 510,158 $ 408,037 $ (1,064)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 2,616     2,616  
Unrealized gain (loss) on investment, net of tax 38       38
Stock-based compensation 1,248   1,280 (32)  
Issuance of restricted and deferred stock units (in shares)   30,547      
Issuance of restricted and deferred stock units (964)   (964)    
Employee stock purchase plan (in shares)   18,235      
Employee stock purchase plan 1,026   1,026    
Common stock issuance, net of costs (in shares)   1,184,500      
Common stock issuance, net of costs 66,896 $ 1 66,895    
Dividends paid (9,724)     (9,724)  
Ending balance (in shares) at Mar. 31, 2021   29,789,887      
Ending balance at Mar. 31, 2021 978,296 $ 30 578,395 400,897 (1,026)
Beginning balance (in shares) at Dec. 31, 2020   28,556,605      
Beginning balance at Dec. 31, 2020 917,160 $ 29 510,158 408,037 (1,064)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 42,459        
Ending balance (in shares) at Sep. 30, 2021   29,822,182      
Ending balance at Sep. 30, 2021 1,000,711 $ 30 581,201 420,411 (931)
Beginning balance (in shares) at Mar. 31, 2021   29,789,887      
Beginning balance at Mar. 31, 2021 978,296 $ 30 578,395 400,897 (1,026)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 20,775     20,775  
Unrealized gain (loss) on investment, net of tax 107       107
Stock-based compensation 763   791 (28)  
Issuance of restricted and deferred stock units (in shares)   15,040      
Issuance of restricted and deferred stock units (9)   (9)    
Common stock issuance, net of costs (120)   (120)    
Dividends paid (10,133)     (10,133)  
Ending balance (in shares) at Jun. 30, 2021   29,804,927      
Ending balance at Jun. 30, 2021 989,679 $ 30 579,057 411,511 (919)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 19,068     19,068  
Unrealized gain (loss) on investment, net of tax (12)       (12)
Stock-based compensation 1,101   1,130 (29)  
Issuance of restricted and deferred stock units (in shares)   186      
Issuance of restricted and deferred stock units 14   14    
Employee stock purchase plan (in shares)   17,069      
Employee stock purchase plan 1,000   1,000    
Dividends paid (10,139)     (10,139)  
Ending balance (in shares) at Sep. 30, 2021   29,822,182      
Ending balance at Sep. 30, 2021 $ 1,000,711 $ 30 581,201 420,411 (931)
Beginning balance (in shares) at Dec. 31, 2021 30,181,348 30,181,348      
Beginning balance at Dec. 31, 2021 $ 1,034,519 $ 30 606,392 428,260 (163)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 3,737     3,737  
Unrealized gain (loss) on investment, net of tax (181)       (181)
Stock-based compensation 1,532   1,552 (20)  
Issuance of restricted and deferred stock units (in shares)   37,879      
Issuance of restricted and deferred stock units (1,269)   (1,269)    
Employee stock purchase plan (in shares)   17,918      
Employee stock purchase plan 1,049   1,049    
Common stock issuance costs (87)   (87)    
Dividends paid (10,882)     (10,882)  
Ending balance (in shares) at Mar. 31, 2022   30,237,145      
Ending balance at Mar. 31, 2022 $ 1,028,418 $ 30 607,637 421,095 (344)
Beginning balance (in shares) at Dec. 31, 2021 30,181,348 30,181,348      
Beginning balance at Dec. 31, 2021 $ 1,034,519 $ 30 606,392 428,260 (163)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income $ 40,329        
Ending balance (in shares) at Sep. 30, 2022 30,315,265 30,315,265      
Ending balance at Sep. 30, 2022 $ 1,049,347 $ 30 614,226 435,856 (765)
Beginning balance (in shares) at Mar. 31, 2022   30,237,145      
Beginning balance at Mar. 31, 2022 1,028,418 $ 30 607,637 421,095 (344)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 11,558     11,558  
Unrealized gain (loss) on investment, net of tax (248)       (248)
Stock-based compensation 1,018   1,041 (23)  
Issuance of restricted and deferred stock units (in shares)   10,529      
Issuance of restricted and deferred stock units (6)   (6)    
Common stock issuance, net of costs (6)   (6)    
Dividends paid (10,889)     (10,889)  
Ending balance (in shares) at Jun. 30, 2022   30,247,674      
Ending balance at Jun. 30, 2022 1,029,845 $ 30 608,666 421,741 (592)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 25,034     25,034  
Unrealized gain (loss) on investment, net of tax (173)       (173)
Stock-based compensation 1,375   1,398 (23)  
Issuance of restricted and deferred stock units (in shares)   1,316      
Issuance of restricted and deferred stock units 13   13    
Employee stock purchase plan (in shares)   18,667      
Employee stock purchase plan 1,042   1,042    
Common stock issuance, net of costs (in shares)   47,608      
Common stock issuance, net of costs 3,107   3,107    
Dividends paid $ (10,896)     (10,896)  
Ending balance (in shares) at Sep. 30, 2022 30,315,265 30,315,265      
Ending balance at Sep. 30, 2022 $ 1,049,347 $ 30 $ 614,226 $ 435,856 $ (765)