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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]
--- | --- | --- | --- | --- | --- | ---
Beginning of year at Dec. 31, 2013 |  | $ 198,240 | $ 288,182 | $ 1,202,015 | $ 24,851 | $ (559,360)
Dividend reinvestment plan (shares: 38,947 – 2015; 44,322 - 2014) |  | 89 | 957 |  |  |
Stock purchase and compensation plans (shares: 686,984 - 2015; 588,858 - 2014) |  | 1,178 | 11,286 |  |  |
Net income | $ 100,477 |  |  | 100,477 |  |
Dividends to stockholders ($0.42 per share - 2015; $0.39 per share - 2014) |  |  |  | (22,344) |  |
Other comprehensive (loss) income | 24,274 |  |  |  | 24,274 |
Acquisition of treasury stock (shares: 139,031 - 2015; 130,573 - 2014) |  |  |  |  |  | (2,920)
End of period at Sep. 30, 2014 | 1,266,925 | 199,507 | 300,425 | 1,280,148 | 49,125 | (562,280)
Beginning of year at Dec. 31, 2014 | 1,275,586 | 199,896 | 305,385 | 1,313,440 | 19,788 | (562,923)
Dividend reinvestment plan (shares: 38,947 – 2015; 44,322 - 2014) |  | 78 | 1,014 |  |  |
Stock purchase and compensation plans (shares: 686,984 - 2015; 588,858 - 2014) |  | 1,374 | 14,588 |  |  |
Net income | 120,472 |  |  | 120,472 |  |
Dividends to stockholders ($0.42 per share - 2015; $0.39 per share - 2014) |  |  |  | (24,376) |  |
Other comprehensive (loss) income | (25,827) |  |  |  | (25,827) |
Acquisition of treasury stock (shares: 139,031 - 2015; 130,573 - 2014) |  |  |  |  |  | (3,887)
End of period at Sep. 30, 2015 | $ 1,359,022 | $ 201,348 | $ 320,987 | $ 1,409,536 | $ (6,039) | $ (566,810)

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