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Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 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
Year ended December 31, 2017 |  |  |  |  |  |  |  |
Operating revenue |  | $ | 129,903 |  | $ | 129,616 |  | $ | 182,114 |  | $ | 165,703
Operating income |  | 19,363 |  | 21,313 |  | 12,999 |  | 9,869
Income before income taxes |  | 19,651 |  | 21,737 |  | 13,062 |  | 10,048
Net income |  | 14,036 |  | 14,616 |  | 7,916 |  | 38,605
Net income per share, basic |  | 0.17 |  | 0.18 |  | 0.10 |  | 0.45
Net income per share, diluted |  | 0.17 |  | 0.18 |  | 0.09 |  | 0.45

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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=109225645&loc=d3e1280-108306 + Details
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