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SELECTED QUARTERLY FINANCIAL INFORMATION (UNAUDITED) | 12 Months Ended
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Dec. 31, 2016
SELECTED QUARTERLY FINANCIAL INFORMATION (UNAUDITED) | 19. SELECTED QUARTERLY FINANCIAL INFORMATION (UNAUDITED) Selected quarterly financial information for each of the quarters in the years ended December 31, 2016 and 2015 is as follows (in thousands, except per share data):
|  | 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 |
|  | March 31, 2015 |  |  | June 30, 2015 |  |  | September 30, 2015 |  |  | December 31, 2015 |
Revenue |  | $ | 426,000 |  |  | $ | 459,295 |  |  | $ | 459,957 |  |  | $ | 447,835 |
Operating income |  |  | 68,826 |  |  |  | 79,753 |  |  |  | 65,436 |  |  |  | 66,539 |
Net income |  |  | 57,277 |  |  |  | 65,303 |  |  |  | 50,676 |  |  |  | 48,598 |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 0.49 |  |  | $ | 0.56 |  |  | $ | 0.43 |  |  | $ | 0.41 |
Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 0.49 |  |  | $ | 0.55 |  |  | $ | 0.43 |  |  | $ | 0.41 |

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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