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STOCKHOLDERS' EQUITY (Tables) | 6 Months Ended
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Jun. 30, 2019
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, 2018 | 669 |  |  | $ | 6.37 |  |  |  |  |
Granted | — |  |  | $ | — |  |  |  |  |
Exercised | (378 | ) |  | $ | 6.03 |  |  |  |  |
Forfeited | — |  |  | $ | — |  |  |  |  |
Outstanding, June 30, 2019 | 291 |  |  | $ | 6.80 |  |  | 5.4 |  | $ | 9,557 |
Exercisable, June 30, 2019 | 291 |  |  | $ | 6.80 |  |  | 5.4 |  | $ | 9,557 |
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, 2018 | 686 |  |  | $ | 15.56 |  |  |  |  |
Granted | 161 |  |  | $ | 37.02 |  |  |  |  |
Class A Common Stock Vested | (216 | ) |  | $ | 12.13 |  |  |  |  |
Forfeited | (4 | ) |  | $ | 17.75 |  |  |  |  |
Outstanding, June 30, 2019 | 627 |  |  | $ | 18.68 |  |  | 1.0 |  | $ | 10,854 |
Unvested, June 30, 2019 | 952 |  |  | $ | 19.48 |  |  | 1.1 |  | $ | 16,909 |
(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 325 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 effect of cash flow hedges related to derivative instruments on the consolidated balance sheet follows:
|  |  | Fair Value
| Balance Sheet Location |  | June 30, 2019 |  | December 31, 2018
Interest rate swaps | Other current assets |  | $ | 6 |  |  | $ | 338 |
Interest rate swaps | Other non-current assets |  | — |  |  | 482 |
|  |  | $ | 6 |  |  | $ | 820 |
Interest rate swaps | Other accrued liabilities |  | $ | 1,308 |  |  | $ | 387 |
Interest rate swaps | Other long-term liabilities |  | 4,152 |  |  | 1,555 |
|  |  | $ | 5,460 |  |  | $ | 1,942 |
Interest rate swaps | Accumulated other comprehensive loss |  | $ | (5,712 | ) |  | $ | (1,196 | )
Interest rate swaps - tax provision | Accumulated other comprehensive loss |  | (112 | ) |  | (112 | )
|  |  | $ | (5,824 | ) |  | $ | (1,308 | )
A summary of the amount of loss on cash flow hedging relationships related to interest rate swaps reclassified from accumulated other comprehensive income into earnings follows:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Statement of Operations Location |  | (Expense) Income |  | (Expense) Income
Interest expense |  | $ | (44 | ) |  | $ | (38 | ) |  | $ | (69 | ) |  | $ | (91 | )
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, 2018 | $ | (1,308 | )
Other comprehensive loss before reclassifications | (4,585 | )
Amounts reclassified from accumulated other comprehensive loss | 69 |
Income tax benefit (provision) related to items of other comprehensive loss | — |
Net current-period other comprehensive loss | (4,516 | )
Balance, June 30, 2019 | $ | (5,824 | )
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 June 30, |  | Six Months Ended June 30, |  |
|  | 2019 |  | 2018 |  | 2019 |  | 2018 |  |
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 |  | $ | 44 |  |  | $ | 38 |  |  | $ | 69 |  |  | $ | 91 |  |  | Interest expense
|  | 44 |  |  | 38 |  |  | 69 |  |  | 91 |  |  | Income (loss) before income taxes
|  | — |  |  | — |  |  | — |  |  | — |  |  | (Benefit) provision for income taxes
|  | $ | 44 |  |  | $ | 38 |  |  | $ | 69 |  |  | $ | 91 |  |  | Net income (loss)

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