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STOCKHOLDERS' EQUITY (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Summary of Stock Option Activity
A summary of stock option activity is as follows:
 
Stock Options
 
Weighted
Average
Exercise Price
 
Weighted
Average
Remaining
Contractual
Term (years)
 
Aggregate
Intrinsic Value
Outstanding, December 31, 2017
727

 
$
5.82

 
 
 
 
Granted
—

 
$
—

 
 
 
 
Exercised
(98
)
 
$
4.80

 
 
 
 
Forfeited or expired
—

 
$
—

 
 
 
 
Market-based stock options vested (1)
40

 
$
12.48

 
7.9
 
 
Outstanding, December 31, 2018
669

 
$
6.37

 
5.6
 
$
14,788

Exercisable, December 31, 2018
669

 
$
6.37

 
5.6
 
$
14,788

(1)
Market-based performance stock option grants were included at 100% until they vested on December 31, 2018, at which point the actual number of options vested was adjusted based on the actual attainment of performance targets and market achievements.
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, 2017
1,091

 
$
9.81

 
 
 
 
Granted
230

 
$
24.92

 
 
 
 
Class A common stock vested
(632
)
 
$
9.04

 
 
 
 
Forfeited or canceled
(3
)
 
$
13.73

 
 
 
 
Outstanding, December 31, 2018
686

 
$
15.56

 
1.2
 
$
8,877

Unvested, December 31, 2018
951

 
$
15.95

 
1.3
 
$
11,929

(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 265 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 (loss) income are as follows:
 
Marketable
Securities
 
Interest Rate Swaps
 
Total
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
59

 
(143
)
 
(84
)
Amounts reclassified from accumulated other comprehensive income (loss)
—

 
421

 
421

Income tax expense related to items in other comprehensive income (loss)
27

 
(112
)
 
(85
)
Other comprehensive income, net
86

 
166

 
252

Balance as of December 31, 2017
18

 
166

 
184

Cumulative effect of new accounting principle
(18
)
 
—

 
(18
)
Other comprehensive loss before reclassifications
—

 
(1,837
)
 
(1,837
)
Amounts reclassified from accumulated other comprehensive loss
—

 
363

 
363

Income tax expense related to items in other comprehensive income
—

 
—

 
—

Other comprehensive loss, net
—

 
(1,474
)
 
(1,474
)
Balance as of December 31, 2018
$
—

 
$
(1,308
)
 
$
(1,308
)
Reclassification Out of Accumulated Other Comprehensive Income (Loss)
A summary of reclassifications out of accumulated other comprehensive (loss) income for fiscal years 2018, 2017 and 2016 is as follows:
 
Fiscal Year Ended
December 31,
 
 
 
2018
 
2017
 
2016
 
 
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
$
363

 
$
421

 
$
—

 
Interest expense
 
363

 
421

 
—

 
Income (loss) before income taxes
 
—

 
—

 
—

 
(Benefit) provision for income taxes
 
$
363

 
$
421

 
$
—

 
Net income (loss)