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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional paid-in capital [Member]
Retained earnings [Member]
Accumulated other comprehensive income (loss) [Member]
Treasury stock [Member]
Beginning of year at Dec. 31, 2015   $ 201,723 $ 326,656 $ 1,446,192 $ (9,425) $ (567,105)
Dividend reinvestment plan (shares: 22,278 – 2017; 29,865 – 2016)   60 1,035      
Stock purchase and compensation plans (shares: 537,588 – 2017; 613,964 – 2016)   1,228 15,155      
Net income $ 119,135     119,135    
Dividends to stockholders ($0.48 per share – 2017; $0.45 per share – 2016)       (26,399)    
Other comprehensive income 71,634       71,634  
Acquisition of treasury stock (shares: 136,012 – 2017; 152,392 – 2016)           (4,985)
End of period at Sep. 30, 2016 1,574,904 203,011 342,846 1,538,928 62,209 (572,090)
Beginning of year at Dec. 31, 2016 1,531,370 203,241 347,295 1,568,881 (15,950) (572,097)
Dividend reinvestment plan (shares: 22,278 – 2017; 29,865 – 2016)   45 1,025      
Stock purchase and compensation plans (shares: 537,588 – 2017; 613,964 – 2016)   1,075 14,417      
Net income 138,584     138,584    
Dividends to stockholders ($0.48 per share – 2017; $0.45 per share – 2016)       (28,424)    
Other comprehensive income 47,265       47,265  
Acquisition of treasury stock (shares: 136,012 – 2017; 152,392 – 2016)           (6,005)
End of period at Sep. 30, 2017 $ 1,699,352 $ 204,361 $ 362,737 $ 1,679,041 $ 31,315 $ (578,102)