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STOCKHOLDERS' EQUITY | 3 Months Ended
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Mar. 31, 2019
Equity [Abstract] |
STOCKHOLDERS' EQUITY | STOCKHOLDERS' EQUITY Recent Developments In the three months ended March 31, 2019, we completed a public offering of 3,565 shares of our Class A common stock at a public offering price of $29.50 per share. The offering resulted in net proceeds to us of $100,446, after deducting underwriting discounts and commissions and offering expenses. The net proceeds from the offering were and are to be used for general corporate purposes, including potential acquisitions or development of new operations or assets with the goal of complementing or expanding our business, working capital and capital expenditures. 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 March 31, 2019, there were 1,553 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 (1) |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value
Outstanding, December 31, 2018 | 669 |  |  | $ | 6.37 |  |  |  |  |
Granted | — |  |  | $ | — |  |  |  |  |
Exercised | (65 | ) |  | $ | 4.00 |  |  |  |  |
Forfeited | — |  |  | $ | — |  |  |  |  |
Outstanding, March 31, 2019 | 604 |  |  | $ | 6.62 |  |  | 5.5 |  | $ | 17,463 |
Exercisable, March 31, 2019 | 604 |  |  | $ | 6.62 |  |  | 5.5 |  | $ | 17,463 |
Stock-based compensation expense for stock options was $0 during the three months ended March 31, 2019 as compared to $124 during the three months ended March 31, 2018. During the three months ended March 31, 2019, the aggregate intrinsic value of stock options exercised was $2,017. 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 typically 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, 2018 | 686 |  |  | $ | 15.56 |  |  |  |  |
Granted | 66 |  |  | $ | 34.49 |  |  |  |  |
Class A Common Stock Vested | (194 | ) |  | $ | 10.75 |  |  |  |  |
Forfeited | (4 | ) |  | $ | 15.21 |  |  |  |  |
Outstanding, March 31, 2019 | 554 |  |  | $ | 19.54 |  |  | 1.4 |  | $ | 8,873 |
Unvested, March 31, 2019 | 819 |  |  | $ | 18.71 |  |  | 1.3 |  | $ | 13,796 |
(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 $1,390 during the three months ended March 31, 2019 as compared to $1,930 during the three months ended March 31, 2018. During the three months ended March 31, 2019, the total fair value of other stock awards vested was $6,890. As of March 31, 2019, total unrecognized stock-based compensation expense related to outstanding restricted stock and restricted stock units was $4,607, which will be recognized over a weighted average period of 1.8 years. As of March 31, 2019, maximum unrecognized stock-based compensation expense related to outstanding performance stock units, assuming the attainment of maximum performance targets, was $3,786 to be recognized over a weighted average period of 1.1 years. We also recorded $41 of stock-based compensation expense related to our Amended and Restated 1997 Employee Stock Purchase Plan during the three months ended March 31, 2019 as compared to $23 during the three months ended March 31, 2018. Accumulated Other Comprehensive Loss 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 | (1,582 | )
Amounts reclassified from accumulated other comprehensive loss | 25 |
Income tax expense related to items of other comprehensive loss | — |
Net current-period other comprehensive loss | (1,557 | )
Balance, March 31, 2019 | $ | (2,865 | )
A summary of reclassifications out of accumulated other comprehensive loss, net of tax follows:
|  | Three Months Ended March 31, |  |
|  | 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 |  | $ | 25 |  |  | $ | 53 |  |  | Interest expense
|  | 25 |  |  | 53 |  |  | Loss before income taxes
|  | — |  |  | 209 |  |  | Provision (benefit) for income taxes
|  | $ | 25 |  |  | $ | (156 | ) |  | Net loss

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- Definition The entire disclosure for accounts comprising shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income, and compensation-related costs for equity-based compensation. Includes, but is not limited to, disclosure of policies, compensation plan details, equity-based arrangements to obtain goods and services, deferred compensation arrangements, and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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