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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), net of tax:
Treasury stock, at cost
Beginning balance at Dec. 31, 2016   $ 65 $ 453,479 $ 1,155,732 $ 163,921 $ (479,215)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Options exercised, 2018, 131,324 shares; 2017, 156,211 shares   0        
Conversion of common stock units, 2018, 30,368 shares; 2017, 15,981 shares   0        
Conversion of restricted stock units, 2018, 170,406 shares; 2017, 293,002 shares   0        
Options exercised and conversion of common stock units and restricted stock units     2,773      
Share-based compensation expense     5,816      
Net income $ 44,130     44,130    
Dividends, 2018, $0.855 per share; 2017, $0.825 per share       (34,580)    
Change in net unrealized investment gains on securities 79,980       79,980  
Change in net funded status of benefit plans 0       0  
Cumulative effect of change in accounting principle 0     0 0  
Acquisition of shares, 2018, 2,161 shares; 2017, 48,440 shares           (1,660)
Ending balance at Sep. 30, 2017 1,390,441 65 462,068 1,165,282 243,901 (480,875)
Beginning balance at Jun. 30, 2017         231,693  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 26,551          
Change in net unrealized investment gains on securities 12,208          
Change in net funded status of benefit plans 0          
Cumulative effect of change in accounting principle 0          
Ending balance at Sep. 30, 2017 1,390,441 65 462,068 1,165,282 243,901 (480,875)
Beginning balance at Dec. 31, 2017 1,501,573 65 464,246 1,231,177 286,960 (480,875)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Options exercised, 2018, 131,324 shares; 2017, 156,211 shares   0        
Conversion of common stock units, 2018, 30,368 shares; 2017, 15,981 shares   0        
Conversion of restricted stock units, 2018, 170,406 shares; 2017, 293,002 shares   1        
Options exercised and conversion of common stock units and restricted stock units     3,262      
Share-based compensation expense     6,088      
Net income 38,600     38,600    
Dividends, 2018, $0.855 per share; 2017, $0.825 per share       (36,004)    
Change in net unrealized investment gains on securities (209,178)       (209,178)  
Change in net funded status of benefit plans 0       0  
Cumulative effect of change in accounting principle (15,041)     15,041 (15,041)  
Acquisition of shares, 2018, 2,161 shares; 2017, 48,440 shares           (86)
Ending balance at Sep. 30, 2018 1,304,256 66 473,596 1,248,814 62,741 (480,961)
Beginning balance at Jun. 30, 2018         112,379  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 12,528          
Change in net unrealized investment gains on securities (49,638)          
Change in net funded status of benefit plans 0          
Cumulative effect of change in accounting principle 0          
Ending balance at Sep. 30, 2018 $ 1,304,256 $ 66 $ 473,596 $ 1,248,814 $ 62,741 $ (480,961)