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SELECTED QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2017
Schedule of Selected Quarterly Financial Information | Selected quarterly financial information for each of the quarters in the years ended December 31, 2017 and 2016 is as follows (in thousands, except per share data):
|  | March 31, 2017 |  |  | June 30, 2017 |  |  | September 30, 2017 |  |  | December 31, 2017 |
Revenue |  | $ | 445,684 |  |  | $ | 436,393 |  |  | $ | 442,845 |  |  | $ | 440,576 |
Operating income |  |  | 69,039 |  |  |  | 65,279 |  |  |  | 60,815 |  |  |  | 65,263 |
Net income |  |  | 50,047 |  |  |  | 45,475 |  |  |  | 41,178 |  |  | $ | 41,340 |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 0.42 |  |  | $ | 0.38 |  |  | $ | 0.35 |  |  | $ | 0.35 |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 0.42 |  |  | $ | 0.38 |  |  | $ | 0.35 |  |  | $ | 0.35 |
|  | March 31, 2016 |  |  | June 30, 2016 |  |  | September 30, 2016 |  |  | December 31, 2016 |
Revenue |  | $ | 447,385 |  |  | $ | 463,331 |  |  | $ | 474,935 |  |  | $ | 464,134 |
Operating income |  |  | 64,928 |  |  |  | 77,176 |  |  |  | 73,953 |  |  |  | 80,359 |
Net income |  |  | 46,307 |  |  |  | 57,583 |  |  |  | 55,340 |  |  |  | 60,689 |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 0.39 |  |  | $ | 0.49 |  |  | $ | 0.47 |  |  | $ | 0.52 |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 0.39 |  |  | $ | 0.49 |  |  | $ | 0.47 |  |  | $ | 0.52 |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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Namespace Prefix: | us-gaap_
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