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STOCK-BASED COMPENSATION (Tables)
 3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Components of Stock-Based Compensation Expenses
The following table summarizes the components of stock-based compensation expense recognized in the Company’s condensed consolidated statements of income for the periods indicated:
Three Months Ended
March 31,
20212020
Cost of revenues (exclusive of depreciation and amortization)$11,117 $3,984 
Selling, general and administrative expenses13,436 7,897 
Total$24,553 $11,881 
Stock Options Activity
Stock option activity under the Company’s plans is set forth below:
 Number of
Options 		Weighted Average
Exercise Price 		Aggregate
Intrinsic Value 		Weighted Average
Remaining Contractual Term (in years)
Options outstanding at January 1, 2021
2,772 $61.71 
Options granted81 $387.93 
Options exercised(109)$40.71 
Options forfeited/cancelled(3)$180.85 
Options outstanding at March 31, 2021
2,741 $72.08 $889,755 4.3
Options vested and exercisable as of March 31, 2021
2,428 $52.25 $836,146 3.7
Options expected to vest as of March 31, 2021
287 $223.44 $49,712 8.7
Service-Based Awards Activity
The table below summarizes activity related to the Company’s equity-classified and liability-classified service-based awards for the three months ended March 31, 2021:
Equity-Classified
 Restricted Stock
Equity-Classified
Equity-Settled
Restricted Stock Units
Liability-Classified
Cash-Settled
Restricted Stock Units
 
Number of
Shares 
Weighted Average Grant Date
Fair Value Per Share 
Number of
Shares 
Weighted Average Grant Date
Fair Value Per Share 
Number of
Shares 
Weighted Average Grant Date
Fair Value Per Share 
Unvested service-based awards outstanding at January 1, 2021
9 $167.18 686 $162.15 175 $141.16 
Awards granted— $— 161 $387.51 26 $387.74 
Awards vested— $— (248)$129.61 (77)$119.40 
Awards forfeited/cancelled— $— (6)$179.08 — $148.68 
Unvested service-based awards outstanding at March 31, 2021
9 $167.18 593 $236.71 124 $206.00 
Performance-Based Awards Activity
The table below summarizes activity related to the Company’s equity-classified performance-based awards for the three months ended March 31, 2021:
Equity-Classified
Equity-Settled
Restricted Stock
Equity-Classified
Equity-Settled
Restricted Stock Units
 
Number of
Shares 
Weighted Average Grant Date
Fair Value Per Share 
Number of
Shares 
Weighted Average Grant Date
Fair Value Per Share 
Unvested performance-based awards outstanding at January 1, 2021
9 $165.87 21 $227.16 
Awards granted— $— — $— 
Unvested performance-based awards outstanding at March 31, 2021
9 $165.87 21 $227.16