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Quarterly Financial Information (Unaudited) | 12 Months Ended
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Dec. 31, 2012
Quarterly Financial Information (Unaudited) [Abstract] |
Quarterly Financial Information [Text Block] | Quarterly Financial Information (Unaudited)
|  | First |  | Second |  | Third |  | Fourth
|  | (In Thousands, Except Per Share Data)
Year ended December 31, 2012 |  |  |  |  |  |
Operating revenue |  | $ | 134,833 |  |  | $ | 139,710 |  |  | $ | 135,010 |  |  | $ | 136,192 |
Operating income |  | 23,778 |  |  | 26,748 |  |  | 19,667 |  |  | 24,708 |
Income before income taxes |  | 23,920 |  |  | 26,915 |  |  | 19,858 |  |  | 24,882 |
Net income |  | 16,588 |  |  | 18,227 |  |  | 12,434 |  |  | 14,292 |
Net income per share, basic |  | 0.19 |  |  | 0.21 |  |  | 0.15 |  |  | 0.17 |
Net income per share, diluted |  | 0.19 |  |  | 0.21 |  |  | 0.14 |  |  | 0.17 |
Year ended December 31, 2011 |  |  |  |  |  |
Operating revenue |  | $ | 127,692 |  |  | $ | 137,192 |  |  | $ | 132,529 |  |  | $ | 131,210 |
Operating income |  | 21,873 |  |  | 32,687 |  |  | 25,132 |  |  | 26,865 |
Income before income taxes |  | 22,110 |  |  | 32,895 |  |  | 25,306 |  |  | 27,019 |
Net income |  | 14,879 |  |  | 22,532 |  |  | 15,399 |  |  | 17,122 |
Net income per share, basic |  | 0.16 |  |  | 0.25 |  |  | 0.17 |  |  | 0.20 |
Net income per share, diluted |  | 0.16 |  |  | 0.25 |  |  | 0.17 |  |  | 0.20 |

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