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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 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 
 June 30,
 
Six Months Ended 
 June 30,
 
2015
 
2014
 
2015
 
2014
Cost of revenues
$
3,765

 
$
2,525

 
$
6,249

 
$
3,928

Selling, general and administrative expenses - Acquisition related
4,951

 
1,430

 
9,443

 
2,223

Selling, general and administrative expenses - All other
3,537

 
1,936

 
5,695

 
2,948

Total
$
12,253

 
$
5,891

 
$
21,387

 
$
9,099
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
2,083,700

 
61.43

 
20,420

Options exercised
(862,174
)
 
16.25

 
(47,402
)
Options forfeited/cancelled
(124,023
)
 
28.59

 
(5,288
)
Options outstanding at June 30, 2015
7,936,249

 
$
31.99

 
$
311,418

 
 
 
 
 
 
Options vested and exercisable at June 30, 2015
2,952,470

 
$
15.01

 
$
165,988

Options expected to vest
4,570,435

 
$
41.60

 
$
135,422
Service-based Awards Activity
Summarized activity related to the Company’s service-based awards for the six months ended June 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
63,295

 
62.17

Awards vested
(144,230
)
 
39.46

Awards forfeited/cancelled
(11,372
)
 
32.13

Unvested service-based awards outstanding at June 30, 2015
541,135

 
$
39.25
Performance-based Awards Activity
Summarized activity related to the Company’s performance-based awards for the six months ended June 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
)
 
68.18

Awards forfeited/cancelled
(1,360
)
 
36.57

Changes in the number of awards expected to be delivered
(19,105
)
 
65.64

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

 
$
25.96