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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)

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