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Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019 |  |  |  |  |  |  |  |
Operating revenue |  | $ | 139,536 |  |  | $ | 142,144 |  |  | $ | 147,908 |  |  | $ | 167,227 |
Operating income |  | 20,843 |  |  | 29,030 |  |  | 26,739 |  |  | 17,663 |
Income before income taxes |  | 21,988 |  |  | 30,259 |  |  | 27,415 |  |  | 17,516 |
Net income |  | 17,318 |  |  | 22,361 |  |  | 20,501 |  |  | 12,787 |
Net income per share, basic |  | 0.21 |  |  | 0.27 |  |  | 0.25 |  |  | 0.16 |
Net income per share, diluted |  | 0.21 |  |  | 0.27 |  |  | 0.25 |  |  | 0.16 |
Year ended December 31, 2018 |  |  |  |  |  |  |  |
Operating revenue |  | $ | 156,695 |  |  | $ | 155,826 |  |  | $ | 151,279 |  |  | $ | 147,003 |
Operating income |  | 12,948 |  |  | 22,147 |  |  | 25,132 |  |  | 29,560 |
Income before income taxes |  | 13,290 |  |  | 22,570 |  |  | 25,718 |  |  | 30,339 |
Net income |  | 13,378 |  |  | 17,803 |  |  | 19,056 |  |  | 22,440 |
Net income per share, basic |  | 0.16 |  |  | 0.22 |  |  | 0.23 |  |  | 0.27 |
Net income per share, diluted |  | 0.16 |  |  | 0.22 |  |  | 0.23 |  |  | 0.27 |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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