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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, 2010 |  | $ 15,369 | $ 73,040 | $ 361,680 | $ 8,505
Common stock issued |  | 21 | 474 |  |
Shares acquired and canceled |  | (117) |  | (4,306) |
Tax effect of stock options |  |  | 69 |  |
Stock-based compensation arrangements |  |  | 646 |  |
Net income | 21,470 |  |  | 21,470 |
Dividends on common stock |  |  |  | (7,694) |
Net change | 1,240 |  |  |  | 1,240
Balance at end of period at Jun. 30, 2011 | 470,397 | 15,273 | 74,229 | 371,150 | 9,745
Balance at beginning of period at Mar. 31, 2011 |  | 15,390 | 73,935 | 369,189 | 8,313
Shares acquired and canceled |  | (117) |  | (4,306) |
Tax effect of stock options |  |  | 23 |  |
Stock-based compensation arrangements |  |  | 271 |  |
Net income | 10,115 |  |  | 10,115 |
Dividends on common stock |  |  |  | (3,848) |
Net change | 1,432 |  |  |  | 1,432
Balance at end of period at Jun. 30, 2011 | 470,397 | 15,273 | 74,229 | 371,150 | 9,745
Balance at beginning of period at Dec. 31, 2011 | 483,041 | 15,118 | 77,462 | 381,017 | 9,444
Common stock issued |  | 43 | 722 |  |
Shares acquired and canceled |  | (7) |  | (249) |
Tax effect of stock options |  |  | 199 |  |
Stock-based compensation arrangements |  |  | 798 |  |
Net income | 25,734 |  |  | 25,734 |
Dividends on common stock |  |  |  | (8,235) |
Net change | (2,485) |  |  |  | (2,485)
Balance at end of period at Jun. 30, 2012 | 499,561 | 15,154 | 79,181 | 398,267 | 6,959
Balance at beginning of period at Mar. 31, 2012 |  | 15,145 | 78,420 | 390,881 | 7,511
Common stock issued |  | 16 | 267 |  |
Shares acquired and canceled |  | (7) |  | (249) |
Tax effect of stock options |  |  | 137 |  |
Stock-based compensation arrangements |  |  | 357 |  |
Net income | 11,729 |  |  | 11,729 |
Dividends on common stock |  |  |  | (4,094) |
Net change | (552) |  |  |  | (552)
Balance at end of period at Jun. 30, 2012 | $ 499,561 | $ 15,154 | $ 79,181 | $ 398,267 | $ 6,959

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- Definition The tax effects of employee stock option transactions that are recognized differently for financial reporting and tax purposes, occurring during the period and charged or credited directly to shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 36 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23586-113945 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23594-113945 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e39076-109324 + Details
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