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Selected Quarterly Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Data [Abstract] |
Schedule of selected quarterly data (unaudited) |
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
In thousands, except per share amounts |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Revenues |  | $ | 81,198 |  |  | $ | 94,894 |  |  | $ | 69,633 |  |  | $ | 94,722 |  |  | $ | 63,588 |  |  | $ | 94,424 |  |  | $ | 70,209 |  |  | $ | 99,866 |
Operating income (loss) |  | (5,035 | ) |  | (6,342 | ) |  | (6,308 | ) |  | (1,791 | ) |  | (10,353 | ) |  | 950 |  |  | (4,338 | ) |  | (33,682 | )
Income (loss) before income taxes |  | 23,849 |  |  | (8,862 | ) |  | (7,318 | ) |  | (4,852 | ) |  | (11,421 | ) |  | (2,098 | ) |  | (5,673 | ) |  | (35,942 | )
Net income (loss) |  | $ | 32,629 |  |  | $ | (7,386 | ) |  | $ | (6,734 | ) |  | $ | (2,653 | ) |  | $ | (9,984 | ) |  | $ | (2,480 | ) |  | $ | 1,639 |  |  | $ | (29,341 | )
Basic earnings (loss) per common share |  | $ | 5.24 |  |  | $ | (1.20 | ) |  | $ | (1.10 | ) |  | $ | (0.43 | ) |  | $ | (1.62 | ) |  | $ | (0.40 | ) |  | $ | 0.21 |  |  | $ | (4.73 | )
Diluted earnings (loss) per common share |  | $ | 4.67 |  |  | $ | (1.20 | ) |  | $ | (1.10 | ) |  | $ | (0.43 | ) |  | $ | (1.62 | ) |  | $ | (0.40 | ) |  | $ | 0.21 |  |  | $ | (4.73 | )

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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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