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CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY (USD $) In Thousands | Total | COMMON STOCK [Member] | CAPITAL SURPLUS [Member] | RETAINED EARNINGS [Member] | ACCUMULATED OTHER COMPREHENSIVE INCOME [Member]
--- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2011 |  | $ 15,118 | $ 77,462 | $ 381,017 | $ 9,444
Shares issued |  | 43 | 722 |  |
Net income | 25,734 |  |  | 25,734 |
Net change | (2,485) |  |  |  | (2,485)
Tax effect of stock options |  |  | 199 |  |
Dividends on common stock |  |  |  | (8,235) |
Stock-based compensation arrangements |  |  | 798 |  |
Shares acquired and canceled |  | (7) |  | (249) |
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
Shares issued |  | 16 | 267 |  |
Net income | 11,729 |  |  | 11,729 |
Net change | (552) |  |  |  | (552)
Tax effect of stock options |  |  | 137 |  |
Dividends on common stock |  |  |  | (4,094) |
Stock-based compensation arrangements |  |  | 357 |  |
Shares acquired and canceled |  | (7) |  | (249) |
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 Dec. 31, 2012 | 519,567 | 15,242 | 82,401 | 415,607 | 6,317
Shares issued |  | 59 | 1,028 |  |
Net income | 25,965 |  |  | 25,965 |
Net change | (2,092) |  |  |  | (2,092)
Tax effect of stock options |  |  | 236 |  |
Dividends on common stock |  |  |  | (8,833) |
Stock-based compensation arrangements |  |  | 695 |  |
Shares acquired and canceled |  | (45) |  | (1,619) |
Balance at end of period at Jun. 30, 2013 | 534,961 | 15,256 | 84,360 | 431,120 | 4,225
Balance at beginning of period at Mar. 31, 2013 |  | 15,228 | 82,956 | 423,637 | 5,886
Shares issued |  | 50 | 870 |  |
Net income | 12,593 |  |  | 12,593 |
Net change | (1,661) |  |  |  | (1,661)
Tax effect of stock options |  |  | 213 |  |
Dividends on common stock |  |  |  | (4,411) |
Stock-based compensation arrangements |  |  | 321 |  |
Shares acquired and canceled |  | (22) |  | (699) |
Balance at end of period at Jun. 30, 2013 | $ 534,961 | $ 15,256 | $ 84,360 | $ 431,120 | $ 4,225

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