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Financial Results by Quarter (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Data [Abstract] |
Schedule of Quarterly Financial Information | The following table sets forth supplementary financial data (in thousands, except per share amounts) for each quarter for the years ended December 31, 2019 and 2018, derived from our unaudited quarterly financial statements, with the total amounts for each year derived from our audited annual financial statements. The data set forth below should be read in conjunction with and is qualified in its entirety by reference to our Consolidated Financial Statements.
|  | Year Ended December 31, 2019 (unaudited) |
(in thousands, except per share amount) |  | First Quarter |  |  | Second Quarter |  |  | Third Quarter |  |  | Fourth Quarter |  |  | Total |
Revenues |  | $ | 181,716 |  |  | $ | 215,581 |  |  | $ | 226,302 |  |  | $ | 203,499 |  |  | $ | 827,098 |
Operating income |  | $ | 20,107 |  |  | $ | 24,956 |  |  | $ | 31,196 |  |  | $ | 20,024 |  |  | $ | 96,283 |
Net income |  | $ | 6,560 |  |  | $ | 17,137 |  |  | $ | 20,565 |  |  | $ | 11,399 |  |  | $ | 55,661 |
Net income per share1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.10 |  |  | $ | 0.25 |  |  | $ | 0.30 |  |  | $ | 0.17 |  |  | $ | 0.82 |
Diluted |  | $ | 0.10 |  |  | $ | 0.25 |  |  | $ | 0.30 |  |  | $ | 0.17 |  |  | $ | 0.82 |
|  | Year Ended December 31, 2018 (unaudited) |
(in thousands, except per share amount) |  | First Quarter |  |  | Second Quarter |  |  | Third Quarter |  |  | Fourth Quarter |  |  | Total |
Revenues |  | $ | 199,897 |  |  | $ | 268,233 |  |  | $ | 289,199 |  |  | $ | 217,250 |  |  | $ | 974,579 |
Operating income |  | $ | 27,831 |  |  | $ | 69,417 |  |  | $ | 77,742 |  |  | $ | 9,964 |  |  | $ | 184,954 |
Net income |  | $ | 14,597 |  |  | $ | 46,148 |  |  | $ | 60,336 |  |  | $ | 1,799 |  |  | $ | 122,880 |
Net income per share1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.29 |  |  | $ | 0.73 |  |  | $ | 0.96 |  |  | $ | 0.03 |  |  | $ | 2.03 |
Diluted |  | $ | 0.29 |  |  | $ | 0.73 |  |  | $ | 0.93 |  |  | $ | 0.03 |  |  | $ | 1.99 |
1 | Per share amounts are computed independently for each of the quarters presented. Therefore, the sum of the quarterly per share amounts may not equal the total computed for the year.

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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=118952077&loc=d3e1280-108306 + Details
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