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STOCKHOLDERS' EQUITY (Tables)
 6 Months Ended
Jun. 30, 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
(378
)
 
$
6.03

 
 
 
 
Forfeited
—

 
$
—

 
 
 
 
Outstanding, June 30, 2019
291

 
$
6.80

 
5.4
 
$
9,557

Exercisable, June 30, 2019
291

 
$
6.80

 
5.4
 
$
9,557
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
161

 
$
37.02

 
 
 
 
Class A Common Stock Vested
(216
)
 
$
12.13

 
 
 
 
Forfeited
(4
)
 
$
17.75

 
 
 
 
Outstanding, June 30, 2019
627

 
$
18.68

 
1.0
 
$
10,854

Unvested, June 30, 2019
952

 
$
19.48

 
1.1
 
$
16,909

(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 325 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 effect of cash flow hedges related to derivative instruments on the consolidated balance sheet follows:
 
 
 
Fair Value
 
Balance Sheet Location
 
June 30,
2019
 
December 31,
2018
Interest rate swaps
Other current assets
 
$
6

 
$
338

Interest rate swaps
Other non-current assets
 
—

 
482

 
 
 
$
6

 
$
820

 
 
 
 
 
 
Interest rate swaps
Other accrued liabilities
 
$
1,308

 
$
387

Interest rate swaps
Other long-term liabilities
 
4,152

 
1,555

 
 
 
$
5,460

 
$
1,942

 
 
 
 
 
 
Interest rate swaps
Accumulated other comprehensive loss
 
$
(5,712
)
 
$
(1,196
)
Interest rate swaps - tax provision
Accumulated other comprehensive loss
 
(112
)
 
(112
)
 
 
 
$
(5,824
)
 
$
(1,308
)

A summary of the amount of loss on cash flow hedging relationships related to interest rate swaps reclassified from accumulated other comprehensive income into earnings follows:
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
 
2019
 
2018
 
2019
 
2018
Statement of Operations Location
 
(Expense) Income
 
(Expense) Income
Interest expense
 
$
(44
)
 
$
(38
)
 
$
(69
)
 
$
(91
)

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
(4,585
)
Amounts reclassified from accumulated other comprehensive loss
69

Income tax benefit (provision) related to items of other comprehensive loss
—

Net current-period other comprehensive loss
(4,516
)
Balance, June 30, 2019
$
(5,824
)
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
June 30,
 
Six Months Ended
June 30,
 
 
 
 
2019
 
2018
 
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
 
$
44

 
$
38

 
$
69

 
$
91

 
Interest expense
 
 
44

 
38

 
69

 
91

 
Income (loss) before income taxes
 
 
—

 
—

 
—

 
—

 
(Benefit) provision for income taxes
 
 
$
44

 
$
38

 
$
69

 
$
91

 
Net income (loss)