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QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Data [Abstract] |
Quarterly Financial Data |
Year Ended December 31, 2019 |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
|  | (Thousands of dollars, except per share amounts)
Total revenues |  | $ | 2,779,958 |  |  | $ | 2,457,575 |  |  | $ | 2,263,228 |  |  | $ | 2,663,606 |
Operating income |  | $ | 468,742 |  |  | $ | 476,146 |  |  | $ | 482,151 |  |  | $ | 487,314 |
Net income |  | $ | 337,208 |  |  | $ | 311,963 |  |  | $ | 309,155 |  |  | $ | 320,251 |
Net income available to common shareholders |  | $ | 336,933 |  |  | $ | 311,688 |  |  | $ | 308,880 |  |  | $ | 319,976 |
Earnings per share total |  |  |  |  |  |  |  |
Basic |  | $ | 0.82 |  |  | $ | 0.75 |  |  | $ | 0.75 |  |  | $ | 0.77 |
Diluted |  | $ | 0.81 |  |  | $ | 0.75 |  |  | $ | 0.74 |  |  | $ | 0.77 |
Year Ended December 31, 2018 |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
|  | (Thousands of dollars except per share amounts)
Total revenues |  | $ | 3,102,077 |  |  | $ | 2,960,529 |  |  | $ | 3,393,890 |  |  | $ | 3,136,700 |
Operating income |  | $ | 419,699 |  |  | $ | 448,366 |  |  | $ | 495,534 |  |  | $ | 471,865 |
Net income |  | $ | 266,049 |  |  | $ | 282,179 |  |  | $ | 313,916 |  |  | $ | 292,888 |
Net income available to common shareholders |  | $ | 264,233 |  |  | $ | 280,773 |  |  | $ | 312,984 |  |  | $ | 292,613 |
Earnings per share total |  |  |  |  |  |  |  |
Basic |  | $ | 0.65 |  |  | $ | 0.68 |  |  | $ | 0.76 |  |  | $ | 0.71 |
Diluted |  | $ | 0.64 |  |  | $ | 0.68 |  |  | $ | 0.75 |  |  | $ | 0.70 |

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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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