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CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues and other income: |  |  |
Operating revenues | $ 2,134,043 | $ 3,043,383 | $ 3,057,619
Earnings (losses) from unconsolidated affiliates |  | (5) | 1
Investment income (loss) | 1,438 | 10,218 | (9,499)
Total revenues and other income | 2,135,481 | 3,053,596 | 3,048,121
Costs and other deductions: |  |  |
Direct costs | 1,333,072 | 1,929,331 | 1,976,974
General and administrative expenses | 203,515 | 258,731 | 265,822
Research and engineering | 33,564 | 50,359 | 56,147
Depreciation and amortization | 853,699 | 876,091 | 866,870
Interest expense | 206,274 | 204,311 | 227,124
(Gain)/loss on debt buybacks and exchanges | (228,274) | (11,468) | 5,268
Impairments and other charges | 410,631 | 301,939 | 139,178
Other, net | 28,567 | 33,224 | 29,532
Total costs and other deductions | 2,841,048 | 3,642,518 | 3,566,915
Income (loss) from continuing operations before income taxes | (705,567) | (588,922) | (518,794)
Income tax expense (benefit): |  |  |
Current | (7,430) | 55,625 | 2,388
Deferred | 64,716 | 35,951 | 76,881
Total income tax expense (benefit) | 57,286 | 91,576 | 79,269
Income (loss) from continuing operations, net of tax | (762,853) | (680,498) | (598,063)
Income (loss) from discontinued operations, net of tax | 7 | (12) | (14,663)
Net income (loss) | (762,846) | (680,510) | (612,726)
Less: Net (income) loss attributable to noncontrolling interest | (42,795) | (22,375) | (28,222)
Net income (loss) attributable to Nabors | (805,641) | (702,885) | (640,948)
Less: Preferred stock dividend | (14,611) | (17,244) | (12,305)
Net income (loss) attributable to Nabors common shareholders | (820,252) | (720,129) | (653,253)
Amounts attributable to Nabors common shareholders: |  |  |
Net income (loss) from continuing operations | (820,259) | (720,117) | (638,590)
Net income (loss) from discontinued operations | 7 | (12) | (14,663)
Net income (loss) attributable to Nabors common shareholders | $ (820,252) | $ (720,129) | $ (653,253)
Earnings (losses) per share: |  |  |
Basic from continuing operations (in dollars per share) | $ (118.69) | $ (105.39) | $ (97.42)
Basic from discontinued operations (in dollars per share) |  |  | (2.19)
Total Basic (in dollars per share) | (118.69) | (105.39) | (99.61)
Diluted from continuing operations (in dollars per share) | (118.69) | (105.39) | (97.42)
Diluted from discontinued operations (in dollars per share) |  |  | (2.19)
Total Diluted (in dollars per share) | $ (118.69) | $ (105.39) | $ (99.61)
Weighted-average number of common shares outstanding: |  |  |
Basic (in shares) | 7,059 | 7,032 | 6,688
Diluted (in shares) | 7,059 | 7,032 | 6,688

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