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Quarterly Results of Operations (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Results of Operations (Unaudited) [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] | The following is a summary of the quarterly results of operations for the years ended December 31, 2017 and 2016:
|  | 2017
|  | March 31 |  | June 30 |  | September 30 |  | December 31
Operating revenue |  | 246,982 |  |  | 267,518 |  |  | 280,201 |  |  | 306,116 |
Income from operations |  | 23,189 |  |  | 29,809 |  |  | 26,898 |  |  | 28,776 |
Net income |  | 14,243 |  |  | 19,550 |  |  | 18,155 |  |  | 35,374 |
Net income per share: |  |  |  |  |  |  |  |
Basic |  | $ | 0.47 |  |  | $ | 0.65 |  |  | $ | 0.60 |  |  | $ | 1.19 |
Diluted |  | $ | 0.47 |  |  | $ | 0.64 |  |  | $ | 0.60 |  |  | $ | 1.18 |
|  | 2016
|  | March 31 |  | June 30 |  | September 30 |  | December 31
Operating revenue |  | 229,548 |  |  | 238,637 |  |  | 249,552 |  |  | 264,793 |
Income from operations |  | 21,404 |  |  | (14,348 | ) |  | 24,700 |  |  | 28,223 |
Net income |  | 13,099 |  |  | (10,066 | ) |  | 11,931 |  |  | 12,706 |
Net income per share: |  |  |  |  |  |  |  |
Basic |  | $ | 0.43 |  |  | $ | (0.33 | ) |  | $ | 0.39 |  |  | $ | 0.42 |
Diluted |  | $ | 0.43 |  |  | $ | (0.33 | ) |  | $ | 0.39 |  |  | $ | 0.42 |

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- Definition Quarterly Results of Operations (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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