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Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020 |  |  |  |  |  |
Operating revenue |  | $ | 166,318 |  |  | $ | 160,873 |  |  | $ | 162,282 |  |  | $ | 155,789 |
Operating income |  | 17,326 |  |  | 24,989 |  |  | 27,339 |  |  | 23,765 |
Income before income taxes |  | 17,703 |  |  | 25,146 |  |  | 27,510 |  |  | 23,902 |
Net income |  | 13,238 |  |  | 19,182 |  |  | 20,714 |  |  | 17,672 |
Net income per share, basic |  | 0.16 |  |  | 0.24 |  |  | 0.25 |  |  | 0.22 |
Net income per share, diluted |  | 0.16 |  |  | 0.24 |  |  | 0.25 |  |  | 0.22 |
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 |

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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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