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STOCKHOLDERS' EQUITY (Tables) | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Summary of Stock Option Activity | A summary of stock option activity follows:
| Stock Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value
Outstanding, December 31, 2020 | 90 |  |  | $ | 8.91 |  |  |  |  |
Granted | — |  |  | $ | — |  |  |  |  |
Exercised | (9) |  |  | $ | 12.48 |  |  |  |  |
Forfeited | — |  |  | $ | — |  |  |  |  |
Outstanding, March 31, 2021 | 81 |  |  | $ | 8.51 |  |  | 4.3 |  | $ | 4,467 |
Exercisable, March 31, 2021 | 81 |  |  | $ | 8.51 |  |  | 4.3 |  | $ | 4,467 |
Summary of Restricted Stock, Restricted Stock Unit and Performance Stock Unit Activity | A summary of restricted stock, restricted stock unit and performance stock unit activity follows:
| Restricted Stock, Restricted Stock Units, and Performance Stock Units (1) |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value
Outstanding, December 31, 2020 | 307 |  |  | $ | 41.55 |  |  |  |  |
Granted | 88 |  |  | $ | 67.48 |  |  |  |  |
Class A Common Stock Vested | (68) |  |  | $ | 32.69 |  |  |  |  |
Forfeited | — |  |  | $ | 56.04 |  |  |  |  |
Outstanding, March 31, 2021 | 327 |  |  | $ | 50.37 |  |  | 2.1 |  | $ | 20,750 |
Unvested, March 31, 2021 | 595 |  |  | $ | 50.59 |  |  | 1.9 |  | $ | 37,816 |
(1)Market-based performance stock unit grants are included at the 100% attainment level. Attainment of the maximum performance targets and market achievements would result in the issuance of an additional 268 shares of Class A common stock currently included in unvested.
Summary of Changes in Balances of Each Component of Accumulated Other Comprehensive Loss | A summary of the changes in the balances of each component of accumulated other comprehensive loss, net of tax follows:
|  |  | Interest Rate Swaps
Balance, December 31, 2020 |  |  | $ | (11,517) |
Other comprehensive income before reclassifications |  |  | 3,827 |
Amounts reclassified from accumulated other comprehensive income |  |  | 1,145 |
Income tax provision related to items of other comprehensive income |  |  | (1,142) |
Net current-period other comprehensive income |  |  | 3,830 |
Balance, March 31, 2021 |  |  | $ | (7,687) |
Summary of Reclassifications Out of Accumulated Other Comprehensive Loss | A summary of reclassifications out of accumulated other comprehensive loss, net of tax follows:
|  | Three Months Ended March 31, |  |  |  |
|  | 2021 |  | 2020 |  |  |  |  |  |
Details About Accumulated Other Comprehensive Loss Components |  | Amounts Reclassified Out of Accumulated Other Comprehensive Loss |  | Affected Line Item in the Consolidated Statements of Operations
Interest rate swaps |  | $ | 1,145 |  |  | $ | 367 |  |  |  |  |  |  | Interest expense
|  | (1,145) |  |  | (367) |  |  |  |  |  |  | Income before income taxes
|  | (127) |  |  | 112 |  |  |  |  |  |  | Provision for income taxes
|  | $ | (1,018) |  |  | $ | (479) |  |  |  |  |  |  | Net income

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