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EARNINGS PER SHARE (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Summary of Numerator and Denominators Used in Computation of Earnings Per Share | 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,
| 2018 |  | 2017 |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |  |
Net income (loss) | $ | 22,302 |  |  | $ | 12,080 |  |  | $ | 20,096 |  |  | $ | (41,820 | )
Denominators: |  |  |  |  |  |  |
Number of shares outstanding, end of period: |  |  |  |  |  |  |
Class A common stock | 41,932 |  |  | 41,055 |  |  | 41,932 |  |  | 41,055 |
Class B common stock | 988 |  |  | 988 |  |  | 988 |  |  | 988 |
Unvested restricted stock | (32 | ) |  | (82 | ) |  | (32 | ) |  | (82 | )
Effect of weighted average shares outstanding | (109 | ) |  | (10 | ) |  | (283 | ) |  | (178 | )
Basic weighted average common shares outstanding | 42,779 |  |  | 41,951 |  |  | 42,605 |  |  | 41,783 |
Impact of potentially dilutive securities: |  |  |  |  |  |  |
Dilutive effect of stock options and other stock awards | 1,396 |  |  | 1,344 |  |  | 1,333 |  |  | — |
Diluted weighted average common shares outstanding | 44,175 |  |  | 43,295 |  |  | 43,938 |  |  | 41,783 |
Anti-dilutive potentially issuable shares | — |  |  | — |  |  | 2 |  |  | 2,560 |

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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://www.xbrl.org/2003/role/presentationRef -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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