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CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenues and other income: |  |  |
Operating revenues | $ 3,043,383 | $ 3,057,619 | $ 2,564,285
Earnings (losses) from unconsolidated affiliates | (5) | 1 | 7
Investment income (loss) | 10,218 | (9,499) | 1,194
Total revenues and other income | 3,053,596 | 3,048,121 | 2,565,486
Costs and other deductions: |  |  |
Direct costs | 1,929,331 | 1,976,974 | 1,718,069
General and administrative expenses | 258,731 | 265,822 | 251,184
Research and engineering | 50,359 | 56,147 | 51,069
Depreciation and amortization | 876,091 | 866,870 | 842,943
Interest expense | 204,311 | 227,124 | 222,889
Impairments and other charges | 290,471 | 144,446 | 44,536
Other, net | 33,224 | 29,532 | 14,880
Total costs and other deductions | 3,642,518 | 3,566,915 | 3,145,570
Income (loss) from continuing operations before income taxes | (588,922) | (518,794) | (580,084)
Income tax expense (benefit): |  |  |
Current | 55,625 | 2,388 | (102,080)
Deferred | 35,951 | 76,881 | 19,110
Total income tax expense (benefit) | 91,576 | 79,269 | (82,970)
Income (loss) from continuing operations, net of tax | (680,498) | (598,063) | (497,114)
Income (loss) from discontinued operations, net of tax | (12) | (14,663) | (43,519)
Net income (loss) | (680,510) | (612,726) | (540,633)
Less: Net (income) loss attributable to noncontrolling interest | (22,375) | (28,222) | (6,178)
Net income (loss) attributable to Nabors | (702,885) | (640,948) | (546,811)
Less: Preferred stock dividend | (17,244) | (12,305) |
Net income (loss) attributable to Nabors common shareholders | (720,129) | (653,253) | (546,811)
Amounts attributable to Nabors common shareholders: |  |  |
Net income (loss) from continuing operations | (720,117) | (638,590) | (503,292)
Net income (loss) from discontinued operations | (12) | (14,663) | (43,519)
Net income (loss) attributable to Nabors common shareholders | $ (720,129) | $ (653,253) | $ (546,811)
Earnings (losses) per share: |  |  |
Basic from continuing operations (in dollars per share) | $ (2.11) | $ (1.95) | $ (1.75)
Basic from discontinued operations (in dollars per share) |  | (0.04) | (0.15)
Total Basic (in dollars per share) | (2.11) | (1.99) | (1.90)
Diluted from continuing operations (in dollars per share) | (2.11) | (1.95) | (1.75)
Diluted from discontinued operations (in dollars per share) |  | (0.04) | (0.15)
Total Diluted (in dollars per share) | $ (2.11) | $ (1.99) | $ (1.90)
Weighted-average number of common shares outstanding: |  |  |
Basic (in shares) | 351,617 | 334,397 | 280,653
Diluted (in shares) | 351,617 | 334,397 | 280,653

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