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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
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Income (Loss) Per Share-Basic and Diluted |  |
Net Income (Loss) | $ 46,631 | $ 64,892
Less: Net Income (Loss) Attributable to Noncontrolling Interests | 1,028 | 917
Net Income (Loss) Attributable to Iron Mountain Incorporated | $ 45,603 | $ 63,975
Weighted-average shares—basic (in shares) | 288,756,000 | 287,840,000
Effect of dilutive potential stock options (in shares) | 56,437 | 51,799
Effect of dilutive potential restricted stock, RSUs and PUs (in shares) | 715,850 | 467,334
Weighted-average shares—diluted (in shares) | 289,528,287 | 288,359,133
Income (Loss) from Continuing Operations, Basic (in dollars per share) | $ 0.16 | $ 0.22
Income (Loss) from Continuing Operations, Diluted (in dollars per share) | $ 0.16 | $ 0.22
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) | 4,708,068 | 5,513,714

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