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STOCKHOLDERS' EQUITY (Tables)
 9 Months Ended
Sep. 30, 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
(98
)
 
$
4.80

 
 
 
 
Forfeited
—

 
$
—

 
 
 
 
Outstanding, September 30, 2018
629

 
$
5.98

 
5.7
 
$
15,765

Exercisable, September 30, 2018
429

 
$
4.81

 
4.9
 
$
11,253

Unvested, September 30, 2018
240

 
$
9.16

 
7.5
 
$
5,256

(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
228

 
$
24.87

 
 
 
 
Class A Common Stock Vested
(378
)
 
$
6.91

 
 
 
 
Forfeited
(1
)
 
$
19.28

 
 
 
 
Outstanding, September 30, 2018
940

 
$
14.62

 
1.1
 
$
15,452

Unvested, September 30, 2018
1,390

 
$
14.79

 
1.1
 
$
22,614

(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
—

 
1,286

Amounts reclassified from accumulated other comprehensive income
—

 
247

Income tax expense related to items of other comprehensive income
—

 
(413
)
Net current-period other comprehensive income
—

 
1,120

Balance, September 30, 2018
$
—

 
$
1,286
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
September 30,
 
Nine Months Ended
September 30,
 
 
 
 
2018
 
2017
 
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
 
$
156

 
$
112

 
$
247

 
$
320

 
Interest expense
 
 
156

 
112

 
247

 
320

 
Income (loss) before income taxes
 
 
—

 
—

 
—

 
—

 
Provision (benefit) for income taxes
 
 
$
156

 
$
112

 
$
247

 
$
320

 
Net income (loss)