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SELECTED QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2019
Schedule of Selected Quarterly Financial Information | Selected quarterly financial information for each of the quarters in the years ended December 31, 2019 and 2018 is as follows (in thousands, except per share data):
|  | March 31, 2019 |  |  | June 30, 2019 |  |  | September 30, 2019 |  |  | December 31, 2019 |
Revenue |  | $ | 484,064 |  |  | $ | 490,294 |  |  | $ | 508,522 |  |  | $ | 497,809 |
Operating income |  |  | 73,264 |  |  |  | 70,954 |  |  |  | 71,095 |  |  |  | 66,251 |
Net income |  |  | 49,340 |  |  |  | 48,578 |  |  |  | 48,994 |  |  |  | 41,974 |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 0.42 |  |  | $ | 0.41 |  |  | $ | 0.41 |  |  | $ | 0.35 |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 0.41 |  |  | $ | 0.41 |  |  | $ | 0.41 |  |  | $ | 0.35 |
|  | March 31, 2018 |  |  | June 30, 2018 |  |  | September 30, 2018 |  |  | December 31, 2018 |
Revenue |  | $ | 440,916 |  |  | $ | 449,929 |  |  | $ | 462,728 |  |  | $ | 482,193 |
Operating income |  |  | 58,705 |  |  |  | 61,712 |  |  |  | 64,419 |  |  |  | 64,649 |
Net income |  |  | 37,777 |  |  |  | 39,197 |  |  |  | 40,994 |  |  |  | 41,239 |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 0.32 |  |  | $ | 0.33 |  |  | $ | 0.35 |  |  | $ | 0.35 |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 0.32 |  |  | $ | 0.33 |  |  | $ | 0.34 |  |  | $ | 0.35 |

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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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Namespace Prefix: | us-gaap_
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