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Earnings Per Share | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Earnings Per Share | 4. 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 |
Approximately 2.2 million, 1.9 million and 1.4 million shares of common stock issuable upon exercise of outstanding stock options were excluded from the calculation of diluted earnings per share for the years ended December 31, 2019, 2018 and 2017, respectively, because their effect would have been anti-dilutive. For the year ended December 31, 2018, approximately 0.1 million of the outstanding restricted stock and shares of common stock issuable upon exercise of outstanding stock option awards have been excluded from the calculation of diluted earnings per share because the net loss for the year ended December 31, 2018 causes such securities to be anti-dilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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