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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Summary of Stock Option Activity | A summary of stock option activity is as follows:
| Stock Options (1) |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value
Outstanding, December 31, 2016 | 1,115 |  |  | $ | 6.13 |  |  |  |  |
Granted | — |  |  | $ | — |  |  |  |  |
Exercised | (361 | ) |  | $ | 6.20 |  |  |  |  |
Forfeited or expired | (27 | ) |  | $ | 13.17 |  |  |  |  |
Outstanding, December 31, 2017 | 727 |  |  | $ | 5.82 |  |  | 6.3 |  | $ | 12,495 |
Exercisable, December 31, 2017 | 527 |  |  | $ | 4.81 |  |  | 5.7 |  | $ | 9,590 |
Unvested, December 31, 2017 | 240 |  |  | $ | 9.16 |  |  | 8.3 |  | $ | 3,326 |
(1) | Market-based performance stock option grants are included at 100%. Attainment of maximum performance targets and market achievements would result in the issuance of 40 shares of Class A common stock currently included in unvested.
Schedule of Fair Value of Stock Options Weighted Average Assumptions | The weighted average fair value of stock options granted, with the exception of market-based performance stock option grants, during fiscal years 2017, 2016 and 2015 were $0.00, $0.00 and $5.35 per option, respectively, which were calculated assuming no expected dividend yield using the following weighted average assumptions:
| Fiscal Year Ended December 31,
| 2017 (1) |  | 2016 (1) |  | 2015
Expected life | 0.0 years |  |  | 0.0 years |  |  | 7.2 years |
Risk-free interest rate | — | % |  | — | % |  | 2.02 | %
Expected volatility | — | % |  | — | % |  | 81.31 | %
(1) | In fiscal years 2017 and 2016, we only granted market-based performance stock options, which are discussed separately below.
Summary of Restricted Stock, Restricted Stock Unit and Performance Stock Unit Activity | A summary of restricted stock, restricted stock unit and performance stock unit activity is as follows:
| Restricted Stock, Restricted Stock Units, and Performance Stock Units (1) |  | Weighted Average Grant Price |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value
Outstanding, December 31, 2016 | 1,099 |  |  | $ | 7.03 |  |  |  |  |
Granted | 439 |  |  | $ | 12.32 |  |  |  |  |
Class A common stock vested | (420 | ) |  | $ | 5.21 |  |  |  |  |
Forfeited or canceled | (27 | ) |  | $ | 6.31 |  |  |  |  |
Outstanding, December 31, 2017 | 1,091 |  |  | $ | 9.81 |  |  | 1.3 |  | $ | 14,409 |
Unvested, December 31, 2017 | 1,453 |  |  | $ | 10.48 |  |  | 1.3 |  | $ | 18,216 |
(1) | Market-based performance stock unit grants are included at 100%. Attainment of maximum performance targets and market achievements would result in the issuance of an additional 362 shares of Class A common stock currently included in unvested.
Accumulated Other Comprehensive Income (Loss) | The changes in the balances of each component of accumulated other comprehensive income (loss) are as follows:
| Marketable Securities |  | Interest Rate Swaps |  | Total
Balance as of December 31, 2014 | $ | 58 |  |  | $ | — |  |  | $ | 58 |
Other comprehensive loss | (51 | ) |  | — |  |  | (51 | )
Balance as of December 31, 2015 | 7 |  |  | — |  |  | 7 |
Other comprehensive loss | (75 | ) |  | — |  |  | (75 | )
Balance as of December 31, 2016 | (68 | ) |  | — |  |  | (68 | )
Other comprehensive income (loss) before reclassifications | 86 |  |  | (255 | ) |  | (169 | )
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | 421 |  |  | 421 |
Other comprehensive income, net | 86 |  |  | 166 |  |  | 252 |
Balance as of December 31, 2017 | $ | 18 |  |  | $ | 166 |  |  | $ | 184 |
Reclassification Out of Accumulated Other Comprehensive Income (Loss) | A summary of reclassifications out of accumulated other comprehensive income (loss) for fiscal years 2017, 2016 and 2015 is as follows:
| Fiscal Year Ended December 31, |  |
| 2017 |  | 2016 |  | 2015 |  |
Details About Accumulated Other Comprehensive Income (Loss) Components | Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss) |  | Affected Line Item in the Consolidated Statements of Operations
Interest rate swaps | $ | 421 |  |  | $ | — |  |  | $ | — |  |  | Interest expense
| 421 |  |  | — |  |  | — |  |  | Loss before income taxes
| — |  |  | — |  |  | — |  |  | (Benefit) provision for income taxes
| $ | 421 |  |  | $ | — |  |  | $ | — |  |  | 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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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