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Summary of Significant Accounting Policies - Income Per Share, Allowance for Doubtful Accounts, Income Taxes, and Concentration of Credit Risk (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income (Loss) Per Share-Basic and Diluted |  |  |  |
Income (loss) from continuing operations | $ 108,284 | $ 77,349 | $ 231,107 | $ 209,001
Less: Net Income (Loss) Attributable to Noncontrolling Interests | 609 | (125) | 1,534 | 485
Income (loss) from continuing operations (utilized in numerator of Earnings Per Share calculation) | 107,675 | 77,474 | 229,573 | 208,516
(Loss) income from discontinued operations, net of tax | 0 | (11,605) | 104 | (12,427)
Net Income (Loss) Attributable to Iron Mountain Incorporated | $ 107,675 | $ 65,869 | $ 229,677 | $ 196,089
Weighted-average shares—basic (in shares) | 287,152,000 | 286,159,000 | 286,869,000 | 285,801,000
Effect of dilutive potential stock options (in shares) | 93,752 | 264,451 | 157,928 | 250,574
Effect of dilutive potential restricted stock, RSUs and PUs (in shares) | 445,081 | 558,891 | 528,387 | 463,583
Weighted-average shares—diluted (in shares) | 287,690,833 | 286,982,342 | 287,555,315 | 286,515,157
Earnings (losses) per share—basic: |  |  |  |
Income (loss) from continuing operations (in dollars per share) | $ 0.37 | $ 0.27 | $ 0.80 | $ 0.73
(Loss) income from discontinued operations, net of tax (in dollars per share) | 0 | (0.04) | 0 | (0.04)
Net income (loss) attributable to Iron Mountain Incorporated (in dollars per share) | 0.37 | 0.23 | 0.80 | 0.69
Earnings (losses) per share—diluted: |  |  |  |
Income (loss) from continuing operations (in dollars per share) | 0.37 | 0.27 | 0.80 | 0.73
(Loss) income from discontinued operations, net of tax (in dollars per share) | 0 | (0.04) | 0 | (0.04)
Net income (loss) attributable to Iron Mountain Incorporated (in dollars per share) | $ 0.37 | $ 0.23 | $ 0.80 | $ 0.68
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) | 4,782,661 | 3,253,975 | 4,590,645 | 3,256,206

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