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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Summary of Stock Option Activity | A summary of stock option activity is as follows:
| Stock Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value
Outstanding, December 31, 2019 | 98 |  |  | $ | 9.20 |  |  |  |  |
Granted | — |  |  | $ | — |  |  |  |  |
Exercised | (8) |  |  | $ | 12.48 |  |  |  |  |
Forfeited or expired | — |  |  | $ | — |  |  |  |  |
Outstanding, December 31, 2020 | 90 |  |  | $ | 8.91 |  |  | 4.7 |  | $ | 4,780 |
Exercisable, December 31, 2020 | 90 |  |  | $ | 8.91 |  |  | 4.7 |  | $ | 4,780 |
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 is as follows:
| Restricted Stock, Restricted Stock Units, and Performance Stock Units (1) |  | Weighted Average Grant Price |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value
Outstanding, December 31, 2019 | 393 |  |  | $ | 28.23 |  |  |  |  |
Granted | 162 |  |  | $ | 47.86 |  |  |  |  |
Class A common stock vested | (240) |  |  | $ | 24.17 |  |  |  |  |
Forfeited or canceled | (8) |  |  | $ | 36.05 |  |  |  |  |
Outstanding, December 31, 2020 | 307 |  |  | $ | 41.55 |  |  | 1.7 |  | $ | 19,009 |
Unvested, December 31, 2020 | 509 |  |  | $ | 42.77 |  |  | 1.6 |  | $ | 31,527 |
(1)Market-based performance stock unit grants are included at 100%. Attainment of maximum performance targets and market achievements would result in the issuance of an additional 202 shares of Class A common stock currently included in unvested. The market-based performance stock unit grants that vested in fiscal year 2020 resulted in the issuance of 87 additional shares of Class A common stock.
Accumulated Other Comprehensive Income (Loss) | The changes in the balances of each component of accumulated other comprehensive income (loss) are as follows:
| Marketable Securities |  | Interest Rate Swaps |  |  |  | Total
Balance as of December 31, 2017 | $ | 18 |  |  | $ | 166 |  |  |  |  | $ | 184 |
Cumulative effect of new accounting principle | (18) |  |  | — |  |  |  |  | (18) |
Other comprehensive loss before reclassifications | — |  |  | (1,837) |  |  |  |  | (1,837) |
Amounts reclassified from accumulated other comprehensive income | — |  |  | 363 |  |  |  |  | 363 |
Other comprehensive loss | — |  |  | (1,474) |  |  |  |  | (1,474) |
Balance as of December 31, 2018 | — |  |  | (1,308) |  |  |  |  | (1,308) |
Other comprehensive loss before reclassifications | — |  |  | (5,286) |  |  |  |  | (5,286) |
Amounts reclassified from accumulated other comprehensive loss | — |  |  | 553 |  |  |  |  | 553 |
Other comprehensive loss | — |  |  | (4,733) |  |  |  |  | (4,733) |
Balance as of December 31, 2019 | — |  |  | (6,041) |  |  |  |  | (6,041) |
Cumulative effect of new accounting principle | — |  |  | — |  |  |  |  | — |
Other comprehensive loss before reclassifications | — |  |  | (11,184) |  |  |  |  | (11,184) |
Amounts reclassified from accumulated other comprehensive loss | — |  |  | 3,679 |  |  |  |  | 3,679 |
Income tax benefit related to items in other comprehensive loss | — |  |  | 2,029 |  |  |  |  | 2,029 |
Other comprehensive loss | — |  |  | (5,476) |  |  |  |  | (5,476) |
Balance as of December 31, 2020 | $ | — |  |  | $ | (11,517) |  |  |  |  | $ | (11,517) |
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | A summary of reclassifications out of accumulated other comprehensive income (loss) for fiscal years 2020, 2019 and 2018 is as follows:
| Fiscal Year Ended December 31, |  |
| 2020 |  | 2019 |  | 2018 |  |
Details About Accumulated Other Comprehensive Income (Loss) Components | Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss) |  | Affected Line Item in the Consolidated Statements of Operations
Interest rate swaps | $ | 3,679 |  |  | $ | 115 |  |  | $ | 287 |  |  | Interest expense
| 3,679 |  |  | 115 |  |  | 287 |  |  | Income before income taxes
| (2,029) |  |  | — |  |  | — |  |  | Benefit for income taxes
| $ | 5,708 |  |  | $ | 115 |  |  | $ | 287 |  |  | Net income

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