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STOCKHOLDERS' EQUITY (Tables) | 9 Months Ended
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Sep. 30, 2018
Equity [Abstract] |
Summary of Stock Option Activity | A summary of stock option activity follows:
| Stock Options (1) |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value
Outstanding, December 31, 2017 | 727 |  |  | $ | 5.82 |  |  |  |  |
Granted | — |  |  | $ | — |  |  |  |  |
Exercised | (98 | ) |  | $ | 4.80 |  |  |  |  |
Forfeited | — |  |  | $ | — |  |  |  |  |
Outstanding, September 30, 2018 | 629 |  |  | $ | 5.98 |  |  | 5.7 |  | $ | 15,765 |
Exercisable, September 30, 2018 | 429 |  |  | $ | 4.81 |  |  | 4.9 |  | $ | 11,253 |
Unvested, September 30, 2018 | 240 |  |  | $ | 9.16 |  |  | 7.5 |  | $ | 5,256 |
(1) | Market-based performance stock options are included at the 100% attainment level. Attainment of the maximum performance targets and market achievements would result in the issuance of an additional 40 shares of Class A common stock currently included in unvested.
Summary of Restricted Stock, Restricted Stock Unit and Performance-based 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, 2017 | 1,091 |  |  | $ | 9.81 |  |  |  |  |
Granted | 228 |  |  | $ | 24.87 |  |  |  |  |
Class A Common Stock Vested | (378 | ) |  | $ | 6.91 |  |  |  |  |
Forfeited | (1 | ) |  | $ | 19.28 |  |  |  |  |
Outstanding, September 30, 2018 | 940 |  |  | $ | 14.62 |  |  | 1.1 |  | $ | 15,452 |
Unvested, September 30, 2018 | 1,390 |  |  | $ | 14.79 |  |  | 1.1 |  | $ | 22,614 |
(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 450 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 income, net of tax follows:
| Marketable Securities |  | Interest Rate Swaps
Balance, December 31, 2017 | $ | 18 |  |  | $ | 166 |
Cumulative effect of new accounting principle | (18 | ) |  | — |
Other comprehensive income before reclassifications | — |  |  | 1,286 |
Amounts reclassified from accumulated other comprehensive income | — |  |  | 247 |
Income tax expense related to items of other comprehensive income | — |  |  | (413 | )
Net current-period other comprehensive income | — |  |  | 1,120 |
Balance, September 30, 2018 | $ | — |  |  | $ | 1,286 |
Summary of Reclassifications Out of Accumulated Other Comprehensive Loss | A summary of reclassifications out of accumulated other comprehensive income, net of tax follows:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30, |  |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |  |
Details About Accumulated Other Comprehensive Income Components |  | Amounts Reclassified Out of Accumulated Other Comprehensive Income |  | Affected Line Item in the Consolidated Statements of Operations
Interest rate swaps |  | $ | 156 |  |  | $ | 112 |  |  | $ | 247 |  |  | $ | 320 |  |  | Interest expense
|  | 156 |  |  | 112 |  |  | 247 |  |  | 320 |  |  | Income (loss) before income taxes
|  | — |  |  | — |  |  | — |  |  | — |  |  | Provision (benefit) for income taxes
|  | $ | 156 |  |  | $ | 112 |  |  | $ | 247 |  |  | $ | 320 |  |  | Net income (loss)

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