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STOCKHOLDERS' EQUITY (Tables) | 3 Months Ended
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Mar. 31, 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 | (63 | ) |  | $ | 4.93 |  |  |  |  |
Forfeited | — |  |  | $ | — |  |  |  |  |
Outstanding, March 31, 2018 | 664 |  |  | $ | 5.91 |  |  | 6.2 |  | $ | 11,595 |
Exercisable, March 31, 2018 | 464 |  |  | $ | 4.79 |  |  | 5.4 |  | $ | 8,619 |
Unvested, March 31, 2018 | 240 |  |  | $ | 9.16 |  |  | 8.0 |  | $ | 3,413 |
(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 | 201 |  |  | $ | 24.96 |  |  |  |  |
Class A Common Stock Vested | (340 | ) |  | $ | 6.20 |  |  |  |  |
Forfeited | — |  |  | $ | — |  |  |  |  |
Outstanding, March 31, 2018 | 952 |  |  | $ | 14.29 |  |  | 1.6 |  | $ | 8,977 |
Unvested, March 31, 2018 | 1,402 |  |  | $ | 14.56 |  |  | 1.6 |  | $ | 12,914 |
(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 | — |  |  | 724 |
Amounts reclassified from accumulated other comprehensive income | — |  |  | 53 |
Income tax expense related to items of other comprehensive income | — |  |  | (209 | )
Net current-period other comprehensive income | — |  |  | 568 |
Balance, March 31, 2018 | $ | — |  |  | $ | 734 |
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 March 31, |  |
|  | 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 |  | $ | 53 |  |  | $ | 69 |  |  | Interest expense
|  | 53 |  |  | 69 |  |  | Loss before income taxes
|  | 209 |  |  | — |  |  | (Benefit) provision for income taxes
|  | $ | (156 | ) |  | $ | 69 |  |  | Net loss

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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