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Consolidated Statements of Stockholders' Equity - USD ($)
Total
Common Stock [Member]
Additional paid-in capital [Member]
Retained earnings [Member]
Accumulated other comprehensive (loss) income [Member]
Treasury stock [Member]
Beginning of year at Dec. 31, 2014   $ 199,896,000 $ 305,385,000 $ 1,313,440,000 $ 19,788,000 $ (562,923,000)
Dividend reinvestment plan (shares: 28,607 – 2017; 38,741 – 2016; 50,013 – 2015)   100,000 1,374,000      
Stock purchase and compensation plans (shares: 635,521 – 2017; 720,323 – 2016; 863,426 – 2015)   1,727,000 19,897,000      
Net income $ 165,861,000     165,861,000    
Dividends to stockholders ($0.66 per share – 2017; $0.61 per share – 2016; $0.57 per share – 2015)       (33,109,000)    
Other comprehensive income (loss) (29,213,000)       (29,213,000)  
Acquisition of treasury stock (shares: 136,205 – 2017; 152,595 – 2016; 147,461 – 2015)           (4,182,000)
End of year at Dec. 31, 2015 1,398,041,000 201,723,000 326,656,000 1,446,192,000 (9,425,000) (567,105,000)
Dividend reinvestment plan (shares: 28,607 – 2017; 38,741 – 2016; 50,013 – 2015)   77,000 1,389,000      
Stock purchase and compensation plans (shares: 635,521 – 2017; 720,323 – 2016; 863,426 – 2015)   1,441,000 19,250,000      
Net income 158,495,000     158,495,000    
Dividends to stockholders ($0.66 per share – 2017; $0.61 per share – 2016; $0.57 per share – 2015)       (35,806,000)    
Other comprehensive income (loss) (6,525,000)       (6,525,000)  
Acquisition of treasury stock (shares: 136,205 – 2017; 152,595 – 2016; 147,461 – 2015)           (4,992,000)
End of year at Dec. 31, 2016 1,531,370,000 203,241,000 347,295,000 1,568,881,000 (15,950,000) (572,097,000)
Dividend reinvestment plan (shares: 28,607 – 2017; 38,741 – 2016; 50,013 – 2015)   57,000 1,395,000      
Stock purchase and compensation plans (shares: 635,521 – 2017; 720,323 – 2016; 863,426 – 2015)   1,271,000 19,027,000      
Net income 168,826,000     168,826,000    
Dividends to stockholders ($0.66 per share – 2017; $0.61 per share – 2016; $0.57 per share – 2015)       (39,094,000)    
Other comprehensive income (loss) 36,120,000       36,120,000  
Acquisition of treasury stock (shares: 136,205 – 2017; 152,595 – 2016; 147,461 – 2015)           (6,015,000)
End of year at Dec. 31, 2017 $ 1,712,957,000 $ 204,569,000 $ 367,717,000 $ 1,698,613,000 $ 20,170,000 $ (578,112,000)