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CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenues and other income: |  |  |
Operating revenues | $ 2,017,548 | $ 2,134,043 | $ 3,043,383
Earnings (losses) from unconsolidated affiliates |  |  | (5)
Investment income (loss) | 1,557 | 1,438 | 10,218
Total revenues and other income | 2,019,105 | 2,135,481 | 3,053,596
Costs and other deductions: |  |  |
Direct costs | 1,286,896 | 1,333,072 | 1,929,331
General and administrative expenses | 213,559 | 203,515 | 258,731
Research and engineering | 35,153 | 33,564 | 50,359
Depreciation and amortization | 693,381 | 853,699 | 876,091
Interest expense | 171,476 | 206,274 | 204,311
(Gain)/loss on debt buybacks and exchanges | (13,423) | (228,274) | (11,468)
Impairments and other charges | 66,731 | 410,631 | 301,939
Other, net | 53,421 | 28,567 | 33,224
Total costs and other deductions | 2,507,194 | 2,841,048 | 3,642,518
Income (loss) from continuing operations before income taxes | (488,089) | (705,567) | (588,922)
Income tax expense (benefit): |  |  |
Current | 66,327 | (7,430) | 55,625
Deferred | (10,706) | 64,716 | 35,951
Total income tax expense (benefit) | 55,621 | 57,286 | 91,576
Income (loss) from continuing operations, net of tax | (543,710) | (762,853) | (680,498)
Income (loss) from discontinued operations, net of tax | 20 | 7 | (12)
Net income (loss) | (543,690) | (762,846) | (680,510)
Less: Net (income) loss attributable to noncontrolling interest | (25,582) | (42,795) | (22,375)
Net income (loss) attributable to Nabors | (569,272) | (805,641) | (702,885)
Less: Preferred stock dividend | (3,653) | (14,611) | (17,244)
Net income (loss) attributable to Nabors common shareholders | (572,925) | (820,252) | (720,129)
Amounts attributable to Nabors common shareholders: |  |  |
Net income (loss) from continuing operations | (572,945) | (820,259) | (720,117)
Net income (loss) from discontinued operations | 20 | 7 | (12)
Net income (loss) attributable to Nabors common shareholders | $ (572,925) | $ (820,252) | $ (720,129)
Earnings (losses) per share: |  |  |
Basic from continuing operations (in dollars per share) | $ (76.58) | $ (118.69) | $ (105.39)
Total Basic (in dollars per share) | (76.58) | (118.69) | (105.39)
Diluted from continuing operations (in dollars per share) | (76.58) | (118.69) | (105.39)
Total Diluted (in dollars per share) | $ (76.58) | $ (118.69) | $ (105.39)
Weighted-average number of common shares outstanding: |  |  |
Basic (in shares) | 7,605 | 7,059 | 7,032
Diluted (in shares) | 7,605 | 7,059 | 7,032

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