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STOCK-BASED COMPENSATION (Tables)
 9 Months Ended
Sep. 30, 2019
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 and comprehensive income for the periods indicated:
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2019
 
2018
 
2019
 
2018
Cost of revenues (exclusive of depreciation and amortization)
$
7,580

 
$
7,492

 
$
27,841

 
$
22,835

Selling, general and administrative expenses
7,891

 
7,838

 
25,183

 
23,901

Total
$
15,471

 
$
15,330

 
$
53,024

 
$
46,736
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, 2019
4,082,944

 
$
44.54

 
 
 
 
Options granted
131,849

 
$
169.13

 
 
 
 
Options modified
17,871

 
$
163.55

 
 
 
 
Options exercised
(668,339
)
 
$
43.09

 
 
 
 
Options forfeited/cancelled
(10,701
)
 
$
97.83

 
 
 
 
Options outstanding at September 30, 2019
3,553,624

 
$
49.87

 
$
470,672

 
4.9
 
 
 
 
 
 
 
 
Options vested and exercisable at September 30, 2019
3,129,141

 
$
41.01

 
$
442,179

 
4.5
Options expected to vest at September 30, 2019
397,070

 
$
114.20

 
$
27,050

 
8.3
Service-based Awards Activity
The table below summarizes activity related to the Company’s equity-classified and liability-classified service-based awards for the nine months ended September 30, 2019:
 
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, 2019
793

 
$
63.10

 
797,903

 
$
92.13

 
302,967

 
$
83.99

Awards granted
9,394

 
$
167.18

 
282,628

 
$
170.25

 
55,912

 
$
170.12

Awards modified
—

 
$
—

 
6,897

 
$
170.74

 
668

 
$
168.36

Awards vested
(396
)
 
$
63.10

 
(273,119
)
 
$
86.38

 
(110,012
)
 
$
80.34

Awards forfeited/cancelled
—

 
$
—

 
(35,004
)
 
$
111.93

 
(4,856
)
 
$
94.73

Unvested service-based awards outstanding at September 30, 2019
9,791

 
$
162.96

 
779,305

 
$
122.28

 
244,679

 
$
105.33
Performance-based Awards Activity
The table below summarizes activity related to the Company’s equity-classified performance-based awards for the nine months ended September 30, 2019:
 
Equity-Classified
Equity-Settled
Restricted Stock Units
 
Equity-Classified
Equity-Settled
Restricted Stock
 
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, 2019
29,592

 
$
121.75

 
—

 
$
—

Awards granted
—

 
$
—

 
9,393

 
$
165.87

Awards modified
(29,592
)
 
$
121.75

 
—

 
$
—

Unvested performance-based awards outstanding at September 30, 2019
—

 
$
—

 
9,393

 
$
165.87