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Summary of Unaudited Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | The following financial information reflects all normal recurring adjustments, which are, in the opinion of management, necessary for a fair statement of the results and cash flows of interim periods. Summarized quarterly data for 2018 and 2017 are as follows (in thousands, except per share amounts):
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
2018 |  |  |  |  |  |  |
Total revenues | $ | 56,157 |  | $ | 90,043 |  | $ | 45,663 |  | $ | 59,590
Total operating costs and expenses | 19,116 |  | 19,868 |  | 22,301 |  | 26,441
Income tax (expense) benefit | (10,033) |  | (22,419) |  | (11,864) |  | 14,307
Net income (loss) | 45,279 |  | 73,160 |  | 67,362 |  | (42,482)
Basic per share amounts: |  |  |  |  |  |  |
Net income (loss) | $ | 2.13 |  | $ | 3.45 |  | $ | 3.19 |  | $ | (2.02)
Diluted per share amounts: |  |  |  |  |  |  |
Net income (loss) | $ | 1.83 |  | $ | 2.99 |  | $ | 2.80 |  | $ | (2.02)
Weighted average shares—basic | 21,209 |  | 21,212 |  | 21,148 |  | 21,071
Weighted average shares—diluted | 24,800 |  | 24,438 |  | 24,052 |  | 21,071
2017 |  |  |  |  |  |  |
Total revenues | $ | 29,267 |  | $ | 27,995 |  | $ | 33,375 |  | $ | 50,465
Total operating costs and expenses | 19,051 |  | 14,980 |  | 16,882 |  | 22,113
Income tax expense | (1,114) |  | (2,242) |  | (3,645) |  | (37,674)
Net income (loss) | 5,079 |  | 6,058 |  | 8,426 |  | (7,007)
Basic per share amounts: |  |  |  |  |  |  |
Net income (loss) | $ | 0.24 |  | $ | 0.29 |  | $ | 0.40 |  | $ | (0.33)
Diluted per share amounts: |  |  |  |  |  |  |
Net income (loss) | $ | 0.22 |  | $ | 0.26 |  | $ | 0.36 |  | $ | (0.33)
Weighted average shares—basic | 20,938 |  | 21,013 |  | 21,071 |  | 21,109
Weighted average shares—diluted | 23,019 |  | 23,216 |  | 23,551 |  | 21,109

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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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