STOCKHOLDERS' EQUITY (Tables)

3 Months Ended

Mar. 31, 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	(63	)	$	4.93
Forfeited	—		$	—
Outstanding, March 31, 2018	664		$	5.91	6.2	$	11,595
Exercisable, March 31, 2018	464		$	4.79	5.4	$	8,619
Unvested, March 31, 2018	240		$	9.16	8.0	$	3,413

(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	201		$	24.96
Class A Common Stock Vested	(340	)	$	6.20
Forfeited	—		$	—
Outstanding, March 31, 2018	952		$	14.29	1.6	$	8,977
Unvested, March 31, 2018	1,402		$	14.56	1.6	$	12,914

(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	—			724
Amounts reclassified from accumulated other comprehensive income	—			53
Income tax expense related to items of other comprehensive income	—			(209		)
Net current-period other comprehensive income	—			568
Balance, March 31, 2018	$	—		$	734

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 March 31,
	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	$	53		$	69	Interest expense
	53			69		Loss before income taxes
	209			—		(Benefit) provision for income taxes
	$	(156	)	$	69	Net loss