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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share | The following table sets forth the computation of basic and diluted earnings per share for the years ended December 31, 2019, 2018 and 2017 (in thousands, except per share amounts):
|  | Year Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Acadia Healthcare Company, Inc. |  | $ | 108,923 |  |  | $ | (175,750 | ) |  | $ | 199,835 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding for basic earnings per share |  |  | 87,612 |  |  |  | 87,288 |  |  |  | 86,948 |
Effects of dilutive instruments |  |  | 204 |  |  |  | — |  |  |  | 112 |
Shares used in computing diluted earnings per common share |  |  | 87,816 |  |  |  | 87,288 |  |  |  | 87,060 |
Earnings per share attributable to Acadia Healthcare Company, Inc. stockholders: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.24 |  |  | $ | (2.01 | ) |  | $ | 2.30 |
Diluted |  | $ | 1.24 |  |  | $ | (2.01 | ) |  | $ | 2.30 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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