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Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information (Unaudited) [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] |
|  | First |  | Second |  | Third |  | Fourth
|  | (In Thousands, Except Per Share Data)
Year ended December 31, 2016 |  |  |  |  |  |
Operating revenue |  | $ | 162,786 |  |  | $ | 160,791 |  |  | $ | 149,316 |  |  | $ | 140,044 |
Operating income |  | 20,250 |  |  | 24,507 |  |  | 19,913 |  |  | 20,898 |
Income before income taxes |  | 20,325 |  |  | 24,616 |  |  | 20,037 |  |  | 21,071 |
Net income |  | 14,377 |  |  | 16,368 |  |  | 12,527 |  |  | 13,114 |
Net income per share, basic |  | 0.17 |  |  | 0.20 |  |  | 0.15 |  |  | 0.16 |
Net income per share, diluted |  | 0.17 |  |  | 0.20 |  |  | 0.15 |  |  | 0.16 |
Year ended December 31, 2015 |  |  |  |  |  |
Operating revenue |  | $ | 187,523 |  |  | $ | 191,684 |  |  | $ | 182,533 |  |  | $ | 174,605 |
Operating income |  | 28,261 |  |  | 35,739 |  |  | 24,861 |  |  | 27,719 |
Income before income taxes |  | 28,273 |  |  | 35,800 |  |  | 24,926 |  |  | 27,772 |
Net income |  | 17,612 |  |  | 23,316 |  |  | 15,113 |  |  | 17,015 |
Net income per share, basic |  | 0.20 |  |  | 0.27 |  |  | 0.17 |  |  | 0.20 |
Net income per share, diluted |  | 0.20 |  |  | 0.27 |  |  | 0.17 |  |  | 0.20 |

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- Definition Quarterly Financial Information (Unaudited) [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306 + Details
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