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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (unaudited) - USD ($)
$ in Thousands
Total
Common Shares
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning balance, shares (in shares) at Dec. 31, 2020   41,469,879      
Beginning balance at Dec. 31, 2020 $ 870,966 $ 207,349 $ 414,246 $ 257,878 $ (8,507)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock Issued Under Share-Based Compensation Plans, net of shares withheld for employee taxes (in shares)   70,105      
Stock Issued Under Share-Based Compensation Plans, net of shares withheld for employee taxes (1,614) $ 351 (1,965)    
Stock Issued Under Dividend Reinvestment and Stock Purchase Plans, net of expenses and repurchased shares (67)   (67)    
Net Income 125,152     125,152  
Other Comprehensive Income (Loss) 336       336
Stock Compensation Expense 6,354   6,354    
Common Dividends (48,645)     (48,645)  
Ending balance, shares (in shares) at Sep. 30, 2021   41,539,984      
Ending balance at Sep. 30, 2021 952,482 $ 207,700 418,568 334,385 (8,171)
Beginning balance, shares (in shares) at Jun. 30, 2021   41,538,709      
Beginning balance at Jun. 30, 2021 915,123 $ 207,694 417,870 297,850 (8,291)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock Issued Under Share-Based Compensation Plans, net of shares withheld for employee taxes (in shares)   1,275      
Stock Issued Under Share-Based Compensation Plans, net of shares withheld for employee taxes (126) $ 6 (132)    
Net Income 52,754     52,754  
Other Comprehensive Income (Loss) 120       120
Stock Compensation Expense 830   830    
Common Dividends (16,219)     (16,219)  
Ending balance, shares (in shares) at Sep. 30, 2021   41,539,984      
Ending balance at Sep. 30, 2021 $ 952,482 $ 207,700 418,568 334,385 (8,171)
Beginning balance, shares (in shares) at Dec. 31, 2021 41,551,524 41,551,524      
Beginning balance at Dec. 31, 2021 $ 990,777 $ 207,758 419,760 369,783 (6,524)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock Issued Under Share-Based Compensation Plans, net of shares withheld for employee taxes (in shares)   79,428      
Stock Issued Under Share-Based Compensation Plans, net of shares withheld for employee taxes (2,924) $ 397 (3,321)    
Stock Issued Under Dividend Reinvestment and Stock Purchase Plans, net of expenses and repurchased shares (132)   (132)    
Net Income 242,179     242,179  
Other Comprehensive Income (Loss) (454)       (454)
Stock Compensation Expense 6,141   6,141    
Common Dividends $ (51,564)     (51,564)  
Ending balance, shares (in shares) at Sep. 30, 2022 41,630,952 41,630,952      
Ending balance at Sep. 30, 2022 $ 1,184,023 $ 208,155 422,448 560,398 (6,978)
Beginning balance, shares (in shares) at Jun. 30, 2022   41,630,799      
Beginning balance at Jun. 30, 2022 1,116,543 $ 208,154 421,951 493,351 (6,913)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock Issued Under Share-Based Compensation Plans, net of shares withheld for employee taxes (in shares)   153      
Stock Issued Under Share-Based Compensation Plans, net of shares withheld for employee taxes 0 $ 1 (1)    
Stock Issued Under Dividend Reinvestment and Stock Purchase Plans, net of expenses and repurchased shares (132)   (132)    
Net Income 84,239     84,239  
Other Comprehensive Income (Loss) (65)       (65)
Stock Compensation Expense 630   630    
Common Dividends $ (17,192)     (17,192)  
Ending balance, shares (in shares) at Sep. 30, 2022 41,630,952 41,630,952      
Ending balance at Sep. 30, 2022 $ 1,184,023 $ 208,155 $ 422,448 $ 560,398 $ (6,978)