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STOCKHOLDERS' EQUITY (Tables)
6 Months Ended
Jun. 30, 2021
Equity [Abstract]  
Summary of Stock Option Activity A summary of stock option activity follows:
Stock OptionsWeighted Average Exercise PriceWeighted Average Remaining Contractual Term (years)Aggregate Intrinsic Value
Outstanding, December 31, 202090 $8.91 
Granted— $— 
Exercised(9)$12.48 
Forfeited— $— 
Outstanding, June 30, 202181 $8.51 4.1$4,455 
Exercisable, June 30, 202181 $8.51 4.1$4,455 
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, 2020307 $41.55 
Granted101 $67.36 
Class A Common Stock Vested(81)$35.28 
Forfeited(8)$51.31 
Outstanding, June 30, 2021319 $51.10 1.9$20,233 
Unvested, June 30, 2021584 $51.01 1.7$37,062 
(1)Market-based performance stock unit grants are included at the 100% attainment level. Attainment of the maximum performance targets and market achievements would result in the issuance of an additional 265 shares of Class A common stock currently included in unvested.
Summary of Changes in Balances of Each Component of Accumulated Other Comprehensive Loss A summary of the changes in the balances of each component of accumulated other comprehensive loss, net of tax follows:
 Interest Rate Swaps
Balance, December 31, 2020$(11,517)
Other comprehensive income before reclassifications2,305 
Amounts reclassified from accumulated other comprehensive loss2,347 
Income tax provision related to items of other comprehensive income(1,057)
Net current-period other comprehensive income3,595 
Balance, June 30, 2021$(7,922)
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,
 2021202020212020 
Details About Accumulated Other Comprehensive Loss ComponentsAmounts Reclassified Out of Accumulated Other Comprehensive LossAffected Line Item in the Consolidated
Statements of Operations
Interest rate swaps$1,202 $990 $2,347 $1,357 Interest expense
(1,202)(990)(2,347)(1,357)Income before income taxes
(142)— (269)112 Provision for income taxes
$(1,060)$(990)$(2,078)$(1,469)Net income