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EARNINGS PER SHARE | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
EARNINGS PER SHARE | EARNINGS PER SHARE Basic earnings per share is computed by dividing the net income (loss) from continuing operations attributable to common stockholders by the weighted average number of common shares outstanding during the period. Diluted earnings per share is calculated based on the combined weighted average number of common shares and potentially dilutive shares, which include the assumed exercise of employee stock options, including market-based performance stock options based on the expected achievement of performance targets, unvested restricted stock awards, unvested restricted stock units and unvested performance stock units, including market-based performance units based on the expected achievement of performance targets. In computing diluted earnings per share, we utilize the treasury stock method. A summary of the numerator and denominators used in the computation of earnings per share follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Numerator: |  |  |  |  |  |  |
Net income (loss) attributable to common stockholders | $ | 12,080 |  |  | $ | 7,537 |  |  | $ | (41,820 | ) |  | $ | 5,125 |
Denominators: |  |  |  |  |  |  |
Number of shares outstanding, end of period: |  |  |  |  |  |  |
Class A common stock | 41,055 |  |  | 40,500 |  |  | 41,055 |  |  | 40,500 |
Class B common stock | 988 |  |  | 988 |  |  | 988 |  |  | 988 |
Unvested restricted stock | (82 | ) |  | (109 | ) |  | (82 | ) |  | (109 | )
Effect of weighted average shares outstanding | (10 | ) |  | (2 | ) |  | (178 | ) |  | (210 | )
Basic weighted average common shares outstanding | 41,951 |  |  | 41,377 |  |  | 41,783 |  |  | 41,169 |
Impact of potentially dilutive securities: |  |  |  |  |  |  |
Dilutive effect of stock options and other stock awards | 1,344 |  |  | 910 |  |  | — |  |  | 727 |
Diluted weighted average common shares outstanding | 43,295 |  |  | 42,287 |  |  | 41,783 |  |  | 41,896 |
Anti-dilutive potentially issuable shares | — |  |  | 322 |  |  | 2,560 |  |  | 322 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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