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Consolidated Statements of Stockholders' Equity (Unaudited) (USD $) In Thousands | Total | COMMON STOCK | CAPITAL SURPLUS | RETAINED EARNINGS | ACCUMULATED OTHER COMPREHENSIVE INCOME
--- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2011 |  | $ 15,118 | $ 77,462 | $ 381,017 | $ 9,444
Shares issued |  | 27 | 455 |  |
Net income | 14,005 |  |  | 14,005 |
Dividends on common stock |  |  |  | (4,141) |
Net change | (1,933) |  |  |  | (1,933)
Tax effect of stock options |  |  | 62 |  |
Stock-based compensation arrangements |  |  | 441 |  |
Balance at end of period at Mar. 31, 2012 | 491,957 | 15,145 | 78,420 | 390,881 | 7,511
Balance at beginning of period at Dec. 31, 2012 | 519,567 | 15,242 | 82,401 | 415,607 | 6,317
Shares issued |  | 9 | 158 |  |
Shares acquired and canceled |  | (23) |  | (920) |
Net income | 13,372 |  |  | 13,372 |
Dividends on common stock |  |  |  | (4,422) |
Net change | (431) |  |  |  | (431)
Tax effect of stock options |  |  | 23 |  |
Stock-based compensation arrangements |  |  | 374 |  |
Balance at end of period at Mar. 31, 2013 | $ 527,707 | $ 15,228 | $ 82,956 | $ 423,637 | $ 5,886

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