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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 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 consolidated statements of income and comprehensive income:
 
 
For the Years Ended December 31,
 
 
2015
 
2014
 
2013
Cost of revenues
 
$
13,695

 
$
8,648

 
$
4,823

Selling, general and administrative expenses - Acquisition related
 
18,690

 
8,829

 
4,417

Selling, general and administrative expenses - All other
 
13,448

 
7,143

 
3,910

Total
 
$
45,833

 
$
24,620

 
$
13,150
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, 2013
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 granted
2,219,725

 
62.18

 
36,492

Options exercised
(1,405,826
)
 
14.70

 
(89,860
)
Options forfeited/cancelled
(201,731
)
 
34.48

 
(8,904
)
Options outstanding at December 31, 2015
7,450,914

 
$
34.07

 
$
331,938

 
 
 
 
 
 
Options vested and exercisable at December 31, 2015
2,446,226

 
$
15.95

 
$
153,305

Options expected to vest
4,690,899

 
$
42.51

 
$
169,388
Service-based Awards Activity
Summarized activity related to the Company’s service-based awards for the years ended December 31, 2015, 2014 and 2013 was as follows:
 
Number of
Shares 
 
Weighted Average Grant Date
Fair Value Per Share 
Unvested service-based awards outstanding at January 1, 2013
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

Awards granted
113,614

 
67.38

Awards vested
(279,129
)
 
33.66

Awards forfeited/cancelled
(11,816
)
 
34.47

Unvested service-based awards outstanding at December 31, 2015
456,111

 
$
46.51
Performance-based Awards Activity
Summarized activity related to the Company’s performance-based awards for the years ended December 31, 2015, was as follows:
 
Number of Shares
 
Weighted Average Grant Date Fair Value Per Share
Unvested performance-based awards outstanding at January 1, 2014
—

 
$
—

Awards granted
387,058

 
38.18

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

Awards granted
14,000

 
70.22

Awards vested
(117,749
)
 
40.39

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 December 31, 2015
247,296

 
$
41.19