STOCKHOLDERS' EQUITY (Tables)

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Summary of Stock Option Activity

A summary of stock option activity follows:

	Stock Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Outstanding, December 31, 2020	90	$	8.91
Granted	8	$	68.78
Exercised	(19)	$	8.36
Forfeited	—	$	—
Outstanding, September 30, 2021	79	$	15.41	4.6	$	4,779
Exercisable, September 30, 2021	71	$	9.06	4.0	$	4,719

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 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, 2020	307	$	41.55
Granted	108	$	67.65
Class A Common Stock Vested	(82)	$	35.44
Forfeited	(8)	$	51.22
Outstanding, September 30, 2021	325	$	51.56	1.8	$	24,647
Unvested, September 30, 2021	590	$	51.26	1.5	$	44,796

(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, 2020	$	(11,517)
Other comprehensive income before reclassifications	2,315
Amounts reclassified from accumulated other comprehensive loss	3,551
Income tax provision related to items of other comprehensive income	(1,379)
Net current-period other comprehensive income	4,487
Balance, September 30, 2021	$	(7,030)

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 September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
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	$	1,204	$	1,156	$	3,551	$	2,513	Interest expense
	(1,204)		(1,156)		(3,551)		(2,513)		Income before income taxes
	(496)		—		(765)		112		Provision for income taxes
	$	(708)	$	(1,156)	$	(2,786)	$	(2,625)	Net income