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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income
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 2,417     2,417  
Unrealized gain (loss) on investment, net of tax (135)       (135)
Stock-based compensation 208   251 (43)  
Issuance of restricted and deferred stock units (in shares)   25,781      
Issuance of restricted and deferred stock units (785)   (785)    
Employee stock purchase plan (in shares)   15,552      
Employee stock purchase plan 970   970    
Dividends paid (9,118)     (9,118)  
Ending balance (in shares) at Mar. 31, 2020   28,497,841      
Ending balance at Mar. 31, 2020 883,541 $ 28 507,075 376,447 (9)
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 48,231        
Ending balance (in shares) at Sep. 30, 2020   28,552,177      
Ending balance at Sep. 30, 2020 913,061 $ 29 509,031 403,923 78
Beginning balance (in shares) at Mar. 31, 2020   28,497,841      
Beginning balance at Mar. 31, 2020 883,541 $ 28 507,075 376,447 (9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 19,721     19,721  
Unrealized gain (loss) on investment, net of tax 10       10
Stock-based compensation 966   1,009 (43)  
Issuance of restricted and deferred stock units (in shares)   18,864      
Issuance of restricted and deferred stock units 15 $ 1 14    
Dividends paid (9,122)     (9,122)  
Ending balance (in shares) at Jun. 30, 2020   28,516,705      
Ending balance at Jun. 30, 2020 895,131 $ 29 508,098 387,003 1
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 26,093     26,093  
Unrealized gain (loss) on investment, net of tax 77       77
Stock-based compensation 1,016   1,058 (42)  
Issuance of restricted and deferred stock units (in shares)   19,274      
Issuance of restricted and deferred stock units (985)   (985)    
Employee stock purchase plan (in shares)   16,198      
Employee stock purchase plan 860   860    
Dividends paid (9,131)     (9,131)  
Ending balance (in shares) at Sep. 30, 2020   28,552,177      
Ending balance at Sep. 30, 2020 $ 913,061 $ 29 509,031 403,923 78
Beginning balance (in shares) at Dec. 31, 2020 28,556,605 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 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 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 29,822,182      
Ending balance at Sep. 30, 2021 $ 1,000,711 $ 30 $ 581,201 $ 420,411 $ (931)