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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]
Balance at beginning of year, as adjusted       $ 1,568,881 $ (15,950)  
Beginning of year at Dec. 31, 2016   $ 203,241 $ 347,295 1,568,881 (15,950) $ (572,097)
Dividend reinvestment plan (shares: 6,298 – 2018; 8,249 – 2017)   16 348      
Stock purchase and compensation plans (shares: 349,255 – 2018; 399,762 – 2017)   800 6,596      
Net income $ 50,440     50,440    
Dividends to stockholders ($0.18 per share – 2018; $0.16 per share – 2017)       (9,459)    
Other comprehensive (loss) income 18,040       18,040  
Acquisition of treasury stock (shares: 103,170 – 2018; 127,647 – 2017)           (5,572)
End of period at Mar. 31, 2017 1,592,579 204,057 354,239 1,609,862 2,090 (577,669)
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01 [Member]       0 0  
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2018-02 [Member]       0 0  
Balance at beginning of year, as adjusted       1,723,632 (4,849)  
Beginning of year at Dec. 31, 2017 1,712,957 204,569 367,717 1,698,613 20,170 (578,112)
Dividend reinvestment plan (shares: 6,298 – 2018; 8,249 – 2017)   13 353      
Stock purchase and compensation plans (shares: 349,255 – 2018; 399,762 – 2017)   698 7,085      
Net income 18,925     18,925    
Dividends to stockholders ($0.18 per share – 2018; $0.16 per share – 2017)       (10,725)    
Other comprehensive (loss) income (63,394)       (63,394)  
Acquisition of treasury stock (shares: 103,170 – 2018; 127,647 – 2017)           (6,116)
End of period at Mar. 31, 2018 $ 1,659,796 $ 205,280 $ 375,155 1,731,832 (68,243) $ (584,228)
Cumulative effect of new accounting principle in period of adoption         (25,019)  
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01 [Member]       30,726 (30,700)  
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2018-02 [Member]       $ (5,707) $ 5,700