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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 (loss) income [Member]
Treasury stock [Member]
Balance at beginning of year, as adjusted       $ 1,446,192 $ (9,425)  
Beginning of year at Dec. 31, 2015   $ 201,723 $ 326,656 1,446,192 (9,425) $ (567,105)
Dividend reinvestment plan (shares: 23,493 – 2018; 28,607 – 2017; 38,741 – 2016)   77 1,389      
Stock purchase and compensation plans (shares: 540,337 – 2018; 635,521 – 2017; 720,323 – 2016)   1,441 19,250      
Net income $ 158,495     158,495    
Dividends to stockholders ($0.74 per share – 2018; $0.66 per share – 2017; $0.61 per share – 2016)       (35,806)    
Other comprehensive (loss) income (6,525)       (6,525)  
Acquisition of treasury stock (shares: 110,398 – 2018; 136,205 – 2017; 152,595 – 2016)           (4,992)
End of year at Dec. 31, 2016 1,531,370 203,241 347,295 1,568,881 (15,950) (572,097)
Cumulative effect adjustment | Accounting Standards Update 2016-01 [Member] 0     0 0  
Cumulative effect adjustment | Accounting Standards Update 2018-02 [Member]       0 0  
Balance at beginning of year, as adjusted       1,568,881 (15,950)  
Dividend reinvestment plan (shares: 23,493 – 2018; 28,607 – 2017; 38,741 – 2016)   57 1,395      
Stock purchase and compensation plans (shares: 540,337 – 2018; 635,521 – 2017; 720,323 – 2016)   1,271 19,027      
Net income 168,826     168,826    
Dividends to stockholders ($0.74 per share – 2018; $0.66 per share – 2017; $0.61 per share – 2016)       (39,094)    
Other comprehensive (loss) income 36,120       36,120  
Acquisition of treasury stock (shares: 110,398 – 2018; 136,205 – 2017; 152,595 – 2016)           (6,015)
End of year at Dec. 31, 2017 1,712,957 204,569 367,717 1,698,613 20,170 (578,112)
Cumulative effect adjustment [1]         (25,019)  
Cumulative effect adjustment | Accounting Standards Update 2016-01 [Member] 0     0 0  
Cumulative effect adjustment | Accounting Standards Update 2018-02 [Member]       0 0  
Balance at beginning of year, as adjusted       1,723,632 (4,849)  
Dividend reinvestment plan (shares: 23,493 – 2018; 28,607 – 2017; 38,741 – 2016)   47 1,379      
Stock purchase and compensation plans (shares: 540,337 – 2018; 635,521 – 2017; 720,323 – 2016)   1,081 21,219      
Net income 178,939     178,939    
Dividends to stockholders ($0.74 per share – 2018; $0.66 per share – 2017; $0.61 per share – 2016)       (44,157)    
Other comprehensive (loss) income (73,107)       (73,107)  
Acquisition of treasury stock (shares: 110,398 – 2018; 136,205 – 2017; 152,595 – 2016)           (6,556)
End of year at Dec. 31, 2018 1,791,802 $ 205,697 $ 390,315 1,858,414 (77,956) $ (584,668)
Cumulative effect adjustment | Accounting Standards Update 2016-01 [Member] $ (30,726)     30,726 (30,726)  
Cumulative effect adjustment | Accounting Standards Update 2018-02 [Member]       $ (5,707) $ 5,707  
[1] Upon adoption of ASU 2016-01 and ASU 2018-02 in the first quarter of 2018, we recognized a $25.0 million cumulative-effect adjustment to the opening balance of AOCI, which represents the after-tax net unrealized gain on our equity portfolio as of December 31, 2017 and the one-time reclassification from AOCI to retained earnings for the stranded tax assets that were created in AOCI from the enactment of Tax Reform. See Note 3. "Adoption of Accounting Pronouncements" above for additional information.