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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2014
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 consolidated statements of income and comprehensive income:
 
 
For the Years Ended December 31,
 
 
2014
 
2013
 
2012
Cost of revenues
 
$
8,648

 
$
4,823

 
$
2,809

Selling, general and administrative expenses
 
15,972

 
8,327

 
4,017

Total
 
$
24,620

 
$
13,150

 
$
6,826
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, 2012
6,595,136

 
$
4.65

 
$
48,447

Options granted
1,443,810

 
16.80

 
1,877

Options exercised
(1,552,742
)
 
3.53

 
(22,623
)
Options forfeited/cancelled
(189,495
)
 
11.35

 
(1,279
)
Options outstanding at December 31, 2012
6,296,709

 
$
7.51

 
$
66,682

Options granted
1,987,952

 
23.60

 
22,543

Options exercised
(2,156,898
)
 
4.31

 
(66,066
)
Options forfeited/cancelled
(304,227
)
 
11.50

 
(7,131
)
Options outstanding at December 31, 2013

5,823,536

 
$
13.99

 
$
122,003

Options granted
2,400,500

 
32.51

 
36,584

Options exercised
(1,171,097
)
 
9.05

 
(45,321
)
Options forfeited/cancelled
(214,193
)
 
25.33

 
(4,802
)
Options outstanding at December 31, 2014
6,838,746

 
$
20.98

 
$
183,073

 
 
 
 
 
 
Options vested and exercisable at December 31, 2014
2,406,016

 
$
9.83

 
$
91,236

Options expected to vest
4,074,226

 
$
26.82

 
$
85,274
Service-based Awards Activity
Summarized activity related to the Company’s service-based awards for the years ended December 31, 2014, 2013 and 2012 was as follows:
 
Number of
Shares 
 
Weighted Average Grant Date
Fair Value Per Share 
Unvested service-based awards outstanding at January 1, 2012
—

 
$
—

Awards granted
757,272

 
17.15

Awards vested
(97,400
)
 
12.00

Unvested service-based awards outstanding at December 31, 2012
659,872

 
$
17.92

Awards granted
15,524

 
23.69

Awards vested
(330,468
)
 
17.33

Unvested service-based awards outstanding at December 31, 2013
344,928

 
$
18.74

Awards granted
523,220

 
40.41

Awards vested
(217,668
)
 
17.84

Awards forfeited/cancelled
(17,038
)
 
21.14

Unvested service-based awards outstanding at December 31, 2014
633,442

 
$
36.88
Performance-based Awards Activity
Summarized activity related to the Company’s performance-based awards for the years ended December 31, 2014, was as follows:
 
Number of Shares
 
Weighted Average Grant Date Fair Value Per Share
Unvested performance-based awards outstanding at December 31, 2013
—

 
$
—

Awards granted
387,058

 
38.18

Awards vested
—

 
—

Awards forfeited/cancelled
(2,550
)
 
36.57

Changes in the number of awards expected to be delivered
(12,998
)
 
5.47

Unvested performance-based awards outstanding at December 31, 2014
371,510

 
$
39.34