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Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Summary of Unaudited Quarterly Financial Information |
|  | 1st |  |  | 2nd |  |  | 3rd |  |  | 4th |
|  | Quarter |  |  | Quarter |  |  | Quarter |  |  | Quarter |
2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 809,164 |  |  | $ | 854,418 |  |  | $ | 867,478 |  |  | $ | 795,937 |
Operating loss |  |  | (22,102 | ) |  |  | (9,004 | ) |  |  | (80,281 | ) |  |  | (210,790 | )
Net loss |  |  | (34,417 | ) |  |  | (10,713 | ) |  |  | (75,042 | ) |  |  | (201,249 | )
Net loss per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | (0.16 | ) |  | $ | (0.05 | ) |  | $ | (0.34 | ) |  | $ | (0.93 | )
Diluted |  | $ | (0.16 | ) |  | $ | (0.05 | ) |  | $ | (0.34 | ) |  | $ | (0.93 | )
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 305,175 |  |  | $ | 579,186 |  |  | $ | 684,989 |  |  | $ | 787,334 |
Operating loss |  |  | (92,639 | ) |  |  | (140,236 | ) |  |  | (38,016 | ) |  |  | (21,647 | )
Net income (loss) |  |  | (63,539 | ) |  |  | (92,184 | ) |  |  | (33,769 | ) |  |  | 195,402 |
Net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | (0.40 | ) |  | $ | (0.46 | ) |  | $ | (0.16 | ) |  | $ | 0.88 |
Diluted |  | $ | (0.40 | ) |  | $ | (0.46 | ) |  | $ | (0.16 | ) |  | $ | 0.88 |

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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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