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QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Summary of Quarterly Financial Information | The following is a summary of certain items in the consolidated statements of operations by quarter:
Fiscal Year 2020 | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Revenues | $ | 182,910 |  |  | $ | 188,767 |  |  | $ | 202,667 |  |  | $ | 200,240 |
Operating income | $ | 7,012 |  |  | $ | 17,444 |  |  | $ | 20,633 |  |  | $ | 14,208 |
Net income | $ | 959 |  |  | $ | 12,113 |  |  | $ | 15,117 |  |  | $ | 62,917 |
Earnings per common share: |  |  |  |  |  |  |
Basic weighted average common shares outstanding | 48,005 |  |  | 48,348 |  |  | 48,370 |  |  | 50,436 |
Basic earnings per share | $ | 0.02 |  |  | $ | 0.25 |  |  | $ | 0.31 |  |  | $ | 1.25 |
Diluted weighted average common shares outstanding | 48,262 |  |  | 48,563 |  |  | 48,619 |  |  | 50,719 |
Diluted earnings per share | $ | 0.02 |  |  | $ | 0.25 |  |  | $ | 0.31 |  |  | $ | 1.24 |
Fiscal Year 2019 | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Revenues | $ | 163,664 |  |  | $ | 187,459 |  |  | $ | 198,547 |  |  | $ | 193,619 |
Operating income | $ | 4,442 |  |  | $ | 15,544 |  |  | $ | 18,485 |  |  | $ | 14,604 |
Net (loss) income | $ | (1,714) |  |  | $ | 11,915 |  |  | $ | 12,386 |  |  | $ | 9,066 |
Earnings per common share: |  |  |  |  |  |  |
Basic weighted average common shares outstanding | 45,913 |  |  | 47,464 |  |  | 47,690 |  |  | 47,811 |
Basic earnings per share | $ | (0.04) |  |  | $ | 0.25 |  |  | $ | 0.26 |  |  | $ | 0.19 |
Diluted weighted average common shares outstanding | 45,913 |  |  | 48,221 |  |  | 48,361 |  |  | 48,583 |
Diluted earnings per share | $ | (0.04) |  |  | $ | 0.25 |  |  | $ | 0.26 |  |  | $ | 0.19 |

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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=121640914&loc=d3e1280-108306 + Details
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