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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)

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