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STOCK-BASED COMPENSATION (Tables)
 9 Months Ended
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Costs Related to Stock Compensation Plans
The following costs related to the Company’s stock compensation plans were included in the condensed consolidated statements of income and comprehensive income:
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2015
 
2014
 
2015
 
2014
Cost of revenues
$
3,622

 
$
2,463

 
$
9,871

 
$
6,391

Selling, general and administrative expenses - Acquisition related
4,542

 
2,905

 
13,985

 
5,128

Selling, general and administrative expenses - All other
3,799

 
2,057

 
9,494

 
5,005

Total
$
11,963

 
$
7,425

 
$
33,350

 
$
16,524
Stock Option Activity
Stock option activity under the Company’s plans is set forth below:
 
Number of
Options 
 
Weighted Average
Exercise Price 
 
Aggregate
Intrinsic Value 
Options outstanding at January 1, 2015
6,838,746

 
$
20.98

 
$
183,073

Options granted
2,189,424

 
62.03

 
27,346

Options exercised
(1,086,066
)
 
16.28

 
(63,252
)
Options forfeited/cancelled
(171,222
)
 
33.32

 
(7,054
)
Options outstanding at September 30, 2015
7,770,882

 
$
32.93

 
$
323,191

 
 
 
 
 
 
Options vested and exercisable at September 30, 2015
2,753,236

 
$
15.08

 
$
163,652

Options expected to vest
4,634,538

 
$
42.26

 
$
149,510
Service-based Awards Activity
Summarized activity related to the Company’s service-based awards for the nine months ended September 30, 2015, was as follows:
 
Number of
Shares 
 
Weighted Average Grant Date
Fair Value Per Share 
Unvested service-based awards outstanding at January 1, 2015
633,442

 
$
36.88

Awards granted
100,391

 
39.20

Awards vested
(145,631
)
 
39.45

Awards forfeited/cancelled
(11,372
)
 
32.13

Unvested service-based awards outstanding at September 30, 2015
576,830

 
$
36.73
Performance-based Awards Activity
Summarized activity related to the Company’s performance-based awards for the nine months ended September 30, 2015, was as follows:
 
Number of Shares
 
Weighted Average Grant Date Fair Value Per Share
Unvested performance-based awards outstanding at January 1, 2015
371,510

 
$
39.34

Awards granted
14,000

 
70.22

Awards vested
(114,105
)
 
40.15

Awards forfeited/cancelled
(1,360
)
 
36.57

Changes in the number of awards expected to be delivered
(19,105
)
 
31.70

Unvested performance-based awards outstanding at September 30, 2015
250,940

 
$
41.29