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QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
(In thousands, except per share amounts) | First |  | Second |  | Third |  | Fourth |  | Total
2020 |  |  |  |  |  |  |  |  |
Operating revenues | $ | 386,457 |  |  | $ | 332,348 |  |  | $ | 291,041 |  |  | $ | 456,778 |  |  | $ | 1,466,624 |
Operating income (loss) | 86,401 |  |  | 53,716 |  |  | (7,533) |  |  | 162,892 |  |  | 295,476 |
Net income (loss) | 53,910 |  |  | 30,374 |  |  | (14,961) |  |  | 131,206 |  |  | 200,529 |
Basic earnings (loss) per share | 0.14 |  |  | 0.08 |  |  | (0.04) |  |  | 0.33 |  |  | 0.50 |
Diluted earnings (loss) per share | 0.13 |  |  | 0.08 |  |  | (0.04) |  |  | 0.33 |  |  | 0.50 |
2019 |  |  |  |  |  |  |  |  |
Operating revenues | $ | 641,681 |  |  | $ | 534,117 |  |  | $ | 429,111 |  |  | $ | 461,368 |  |  | $ | 2,066,277 |
Earnings on equity method investments (1) | 3,684 |  |  | 3,650 |  |  | 3,860 |  |  | 69,302 |  |  | 80,496 |
Operating income | 352,959 |  |  | 250,805 |  |  | 129,777 |  |  | 222,209 |  |  | 955,750 |
Net income | 262,763 |  |  | 181,009 |  |  | 90,358 |  |  | 146,940 |  |  | 681,070 |
Basic earnings per share | 0.62 |  |  | 0.43 |  |  | 0.22 |  |  | 0.36 |  |  | 1.64 |
Diluted earnings per share | 0.62 |  |  | 0.43 |  |  | 0.22 |  |  | 0.36 |  |  | 1.63 |
_______________________________________________________________________________ (1) Earnings on equity method investments in the fourth quarter of 2019 includes a gain on sale of $75.8 million associated with the Company's sale of its equity investment in Meade.

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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=121640914&loc=d3e1280-108306 + Details
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