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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2018 | 669 |  |  | $ | 6.37 |  |  |  |  |
Granted | — |  |  | $ | — |  |  |  |  |
Exercised | (571) |  |  | $ | 5.88 |  |  |  |  |
Forfeited or expired | — |  |  | $ | — |  |  |  |  |
Outstanding, December 31, 2019 | 98 |  |  | $ | 9.20 |  |  | 5.8 |  | $ | 3,614 |
Exercisable, December 31, 2019 | 98 |  |  | $ | 9.20 |  |  | 5.8 |  | $ | 3,614 |
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, 2018 | 686 |  |  | $ | 15.56 |  |  |  |  |
Granted | 166 |  |  | $ | 37.24 |  |  |  |  |
Class A common stock vested | (449) |  |  | $ | 12.38 |  |  |  |  |
Forfeited or canceled | (10) |  |  | $ | 23.41 |  |  |  |  |
Outstanding, December 31, 2019 | 393 |  |  | $ | 28.23 |  |  | 1.3 |  | $ | 6,992 |
Unvested, December 31, 2019 | 579 |  |  | $ | 29.69 |  |  | 1.4 |  |  | $ | 9,458 |
(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 186 shares of Class A common stock currently included in unvested. The market-based performance stock unit grants that vested in fiscal year 2019 resulted in the issuance of 178 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, 2016 | $ | (68) |  |  | $ | — |  |  |  |  | $ | (68) |
Other comprehensive income (loss) before reclassifications | 59 |  |  | (143) |  |  |  |  | (84) |
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | 421 |  |  |  |  | 421 |
Income tax expense related to items in other comprehensive income (loss) | 27 |  |  | (112) |  |  |  |  | (85) |
Other comprehensive income, net | 86 |  |  | 166 |  |  |  |  | 252 |
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 loss | — |  |  | 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) |
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | A summary of reclassifications out of accumulated other comprehensive income (loss) for fiscal years 2019, 2018 and 2017 is as follows:
| Fiscal Year Ended December 31, |  |  |  |  |  |
| 2019 |  | 2018 |  | 2017 |  |
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 | $ | 553 |  |  | $ | 363 |  |  | $ | 421 |  |  | Interest expense
| 553 |  |  | 363 |  |  | 421 |  |  | Income (loss) before income taxes
| — |  |  | — |  |  | — |  |  | Benefit for income taxes
| $ | 553 |  |  | $ | 363 |  |  | $ | 421 |  |  | Net income (loss)

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