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EARNINGS PER SHARE
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
EARNINGS PER SHARE EARNINGS PER SHAREBasic earnings per share is computed by dividing net income by the weighted average number of common shares outstanding during the period. Diluted earnings per share is calculated based on the combined weighted average number of common shares and potentially dilutive shares, which include the assumed exercise of employee stock options, unvested restricted stock awards, unvested restricted stock units and unvested performance stock units, including market-based performance units based on the expected achievement of performance targets. In computing diluted earnings per share, we utilize the treasury stock method.A summary of the numerator and denominators used in the computation of earnings per share follows:
 Three Months Ended
June 30,		Six Months Ended
June 30,
 2021202020212020
Numerator:
Net income$11,783 $12,113 $16,094 $13,072 
Denominators:
Number of shares outstanding, end of period:
Class A common stock50,398 47,382 50,398 47,382 
Class B common stock988 988 988 988 
Unvested restricted stock(2)(1)(2)(1)
Effect of weighted average shares outstanding(18)(21)(111)(193)
Basic weighted average common shares outstanding51,366 48,348 51,273 48,176 
Impact of potentially dilutive securities:
Dilutive effect of stock options and other stock awards180 215 193 235 
Diluted weighted average common shares outstanding51,546 48,563 51,466 48,411 
Anti-dilutive potentially issuable shares— 12 48 12