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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, 2013 |  | $ 15,334 | $ 88,803 | $ 448,953 | $ 3,907
Shares issued |  | 115 | 3,174 |  |
Net income | $ 48,138 |  |  | 48,138 |
Net change | 659 |  |  |  | 659
Tax effect of stock options |  |  | 665 |  |
Dividends on common stock |  |  |  | (14,789) |
Stock-based compensation arrangements |  |  | 1,224 |  |
Balance at end of period at Sep. 30, 2014 | 596,183 | 15,449 | 93,866 | 482,302 | 4,566
Balance at beginning of period at Jun. 30, 2014 |  | 15,399 | 91,447 | 468,761 | 4,898
Shares issued |  | 50 | 1,554 |  |
Net income | 18,793 |  |  | 18,793 |
Net change | (332) |  |  |  | (332)
Tax effect of stock options |  |  | 417 |  |
Dividends on common stock |  |  |  | (5,252) |
Stock-based compensation arrangements |  |  | 448 |  |
Balance at end of period at Sep. 30, 2014 | 596,183 | 15,449 | 93,866 | 482,302 | 4,566
Balance at beginning of period at Dec. 31, 2014 | 609,314 | 15,504 | 96,841 | 492,776 | 4,193
Shares issued |  | 87 | 2,065 |  |
Net income | 50,442 |  |  | 50,442 |
Net change | (1,596) |  |  |  | (1,596)
Tax effect of stock options |  |  | 686 |  |
Dividends on common stock |  |  |  | (16,180) |
Stock-based compensation arrangements |  |  | 1,243 |  |
Balance at end of period at Sep. 30, 2015 | 646,061 | 15,591 | 100,835 | 527,038 | 2,597
Balance at beginning of period at Jun. 30, 2015 |  | 15,562 | 99,202 | 517,028 | 2,452
Shares issued |  | 29 | 749 |  |
Net income | 15,630 |  |  | 15,630 |
Net change | 145 |  |  |  | 145
Tax effect of stock options |  |  | 395 |  |
Dividends on common stock |  |  |  | (5,620) |
Stock-based compensation arrangements |  |  | 489 |  |
Balance at end of period at Sep. 30, 2015 | $ 646,061 | $ 15,591 | $ 100,835 | $ 527,038 | $ 2,597

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