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STOCKHOLDERS' EQUITY | 6 Months Ended
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Jun. 30, 2021
Equity [Abstract] |
STOCKHOLDERS' EQUITY | STOCKHOLDERS' EQUITY Stock Based Compensation Shares Available For Issuance In the fiscal year ended December 31, 2016, we adopted the 2016 Incentive Plan (“2016 Plan”). Under the 2016 Plan, we may grant awards up to an aggregate amount of shares equal to the sum of: (i) 2,250 shares of Class A common stock (subject to adjustment in the event of stock splits and other similar events), plus (ii) such additional number of shares of Class A common stock (up to 2,723 shares) as is equal to the sum of the number of shares of Class A common stock that remained available for grant under the 2006 Stock Incentive Plan (“2006 Plan”) immediately prior to the expiration of the 2006 Plan and the number of shares of Class A common stock subject to awards granted under the 2006 Plan that expire, terminate or are otherwise surrendered, canceled, forfeited or repurchased by us. As of June 30, 2021, there were 947 Class A common stock equivalents available for future grant under the 2016 Plan. Stock Options Stock options are granted at a price equal to the prevailing fair value of our Class A common stock at the date of grant. Generally, stock options granted have a term not to exceed ten years and vest over a one-year to four-year period from the date of grant. The fair value of each stock option granted is estimated using a Black-Scholes option-pricing model, which requires extensive use of accounting judgment and financial estimation, including estimates of the expected term stock option holders will retain their vested stock options before exercising them and the estimated volatility of our Class A common stock price over the expected term. 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, June 30, 2021 | 81 |  |  | $ | 8.51 |  |  | 4.1 |  | $ | 4,455 |
Exercisable, June 30, 2021 | 81 |  |  | $ | 8.51 |  |  | 4.1 |  | $ | 4,455 |
We did not record any stock-based compensation expense for stock options during each of the three and six months ended June 30, 2021 and June 30, 2020. As of June 30, 2021, we had no unrecognized stock-based compensation expense related to outstanding stock options. During both the three and six months ended June 30, 2021, the aggregate intrinsic value of stock options exercised was $448. Other Stock Awards Restricted stock awards, restricted stock units and performance stock units, with the exception of market-based performance stock units, are granted at a price equal to the fair value of our Class A common stock at the date of grant. The fair value of each market-based performance stock unit is estimated using a Monte Carlo pricing model, which requires extensive use of accounting judgment and financial estimation, including the estimated share price appreciation plus the value of dividends of our Class A common stock as compared to the Russell 2000 Index over the requisite service period. Generally, restricted stock awards granted to non-employee directors vest incrementally over a three year period beginning on the first anniversary of the date of grant. Restricted stock units granted to non-employee directors vest in full on the first anniversary of the grant date. Restricted stock units granted to employees vest incrementally over an identified service period beginning on the grant date based on continued employment. Performance stock units granted to employees, including market-based performance stock units, vest at a future date following the grant date and are based on the attainment of performance targets and market achievements, as applicable. 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 | 101 |  |  | $ | 67.36 |  |  |  |  |
Class A Common Stock Vested | (81) |  |  | $ | 35.28 |  |  |  |  |
Forfeited | (8) |  |  | $ | 51.31 |  |  |  |  |
Outstanding, June 30, 2021 | 319 |  |  | $ | 51.10 |  |  | 1.9 |  | $ | 20,233 |
Unvested, June 30, 2021 | 584 |  |  | $ | 51.01 |  |  | 1.7 |  | $ | 37,062 |
(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 265 shares of Class A common stock currently included in unvested. Stock-based compensation expense related to restricted stock, restricted stock units and performance stock units was $3,044 and $5,928 during the three and six months ended June 30, 2021, respectively, as compared to $1,763 and $3,277 during the three and six months ended June 30, 2020, respectively. During the three and six months ended June 30, 2021, the total fair value of other stock awards vested was $887 and $5,292, respectively. As of June 30, 2021, total unrecognized stock-based compensation expense related to outstanding restricted stock was $108, which will be recognized over a weighted average period of 2.3 years. As of June 30, 2021, total unrecognized stock-based compensation expense related to outstanding restricted stock units was $5,315, which will be recognized over a weighted average period of 1.9 years. As of June 30, 2021, total expected unrecognized stock-based compensation expense related to outstanding performance stock units was $9,006 to be recognized over a weighted average period of 1.9 years. We also recorded $72 and $128 of stock-based compensation expense related to our Amended and Restated 1997 Employee Stock Purchase Plan during the three and six months ended June 30, 2021, respectively, as compared to $56 and $103 during the three and six months ended June 30, 2020, respectively. Accumulated Other Comprehensive Loss, Net of Tax 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 |  |  | 2,305 |
Amounts reclassified from accumulated other comprehensive loss |  |  | 2,347 |
Income tax provision related to items of other comprehensive income |  |  | (1,057) |
Net current-period other comprehensive income |  |  | 3,595 |
Balance, June 30, 2021 |  |  | $ | (7,922) |
A summary of reclassifications out of accumulated other comprehensive loss, net of tax follows:
|  | Three Months Ended June 30, |  | Six Months Ended June 30, |  |
|  | 2021 |  | 2020 |  | 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 |  | $ | 1,202 |  |  | $ | 990 |  |  | $ | 2,347 |  |  | $ | 1,357 |  |  | Interest expense
|  | (1,202) |  |  | (990) |  |  | (2,347) |  |  | (1,357) |  |  | Income before income taxes
|  | (142) |  |  | — |  |  | (269) |  |  | 112 |  |  | Provision for income taxes
|  | $ | (1,060) |  |  | $ | (990) |  |  | $ | (2,078) |  |  | $ | (1,469) |  |  | Net income

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- Definition The entire disclosure for shareholders' equity and share-based payment arrangement. Includes, but is not limited to, disclosure of policy and terms of share-based payment arrangement, deferred compensation arrangement, and employee stock purchase plan (ESPP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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