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STOCKHOLDERS' EQUITY (Tables)
 12 Months Ended
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