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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) (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, 2012 |  | $ 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
Balance at beginning of period at Dec. 31, 2013 | 556,997 | 15,334 | 88,803 | 448,953 | 3,907
Shares issued |  | 65 | 1,620 |  |
Net income | 29,345 |  |  | 29,345 |
Net change | 991 |  |  |  | 991
Tax effect of stock options |  |  | 248 |  |
Dividends on common stock |  |  |  | (9,537) |
Stock-based compensation arrangements |  |  | 776 |  |
Balance at end of period at Jun. 30, 2014 | 580,505 | 15,399 | 91,447 | 468,761 | 4,898
Balance at beginning of period at Mar. 31, 2014 |  | 15,364 | 89,951 | 458,857 | 3,940
Shares issued |  | 35 | 742 |  |
Net income | 14,688 |  |  | 14,688 |
Net change | 958 |  |  |  | 958
Tax effect of stock options |  |  | 325 |  |
Dividends on common stock |  |  |  | (4,784) |
Stock-based compensation arrangements |  |  | 429 |  |
Balance at end of period at Jun. 30, 2014 | $ 580,505 | $ 15,399 | $ 91,447 | $ 468,761 | $ 4,898

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