XML 18 R6.htm IDEA: XBRL DOCUMENT v3.10.0.1
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: 12,373 – 2018; 15,419 – 2017)   31 693      
Stock purchase and compensation plans (shares: 433,009 – 2018; 515,011 – 2017)   1,030 11,994      
Net income $ 91,866     91,866    
Dividends to stockholders ($0.36 per share – 2018; $0.32 per share – 2017)       (18,927)    
Other comprehensive (loss) income 40,447       40,447  
Acquisition of treasury stock (shares: 105,452 – 2018; 134,910 – 2017)           (5,948)
End of period at Jun. 30, 2017 1,652,556 204,302 359,982 1,641,820 24,497 (578,045)
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: 12,373 – 2018; 15,419 – 2017)   25 686      
Stock purchase and compensation plans (shares: 433,009 – 2018; 515,011 – 2017)   866 13,238      
Net income 77,744     77,744    
Dividends to stockholders ($0.36 per share – 2018; $0.32 per share – 2017)       (21,448)    
Other comprehensive (loss) income (79,668)       (79,668)  
Acquisition of treasury stock (shares: 105,452 – 2018; 134,910 – 2017)           (6,245)
End of period at Jun. 30, 2018 $ 1,698,155 $ 205,460 $ 381,641 1,779,928 (84,517) $ (584,357)
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 (30,726)  
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2018-02 [Member]       $ (5,707) $ 5,707