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STOCKHOLDERS' EQUITY (Tables)
 3 Months Ended
Mar. 31, 2019
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, 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
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, 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.
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 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
)
Summary of Reclassifications Out of Accumulated Other Comprehensive Loss
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