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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2016
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,
 
 
2016
 
2015
 
2014
Cost of revenues
 
$
16,619

 
$
13,695

 
$
8,648

Selling, general and administrative expenses — Acquisition related
 
12,884

 
18,690

 
8,829

Selling, general and administrative expenses — All other
 
19,741

 
13,448

 
7,143

Total
 
$
49,244

 
$
45,833

 
$
24,620
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, 2014
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 granted
313,088

 
70.27

 
(1,866
)
Options exercised
(895,804
)
 
20.13

 
(39,577
)
Options forfeited/cancelled
(227,759
)
 
47.89

 
(3,740
)
Options expired
(3,200
)
 
1.52

 
(201
)
Options outstanding at December 31, 2016
6,637,239

 
$
37.20

 
$
179,936

 
 
 
 
 
 
Options vested and exercisable at December 31, 2016
3,350,682

 
$
25.96

 
$
128,499

Options expected to vest
3,127,635

 
$
48.28

 
$
50,136
Service-based Awards Activity
The table below summarizes activity related to the Company’s equity-classified and liability-classified service-based awards for the years ended December 31, 2016, 2015 and 2014:
 
Equity-Classified Equity-Settled
 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, 2014
344,928

 
$
18.74

 
—

 
$
—

 
—

 
$
—

Awards granted
452,720

 
41.63

 
70,500

 
32.55

 
—

 
—

Awards vested
(217,668
)
 
17.84

 
—

 
—

 
—

 
—

Awards forfeited/cancelled
(17,038
)
 
21.14

 
—

 
—

 
—

 
—

Unvested service-based awards outstanding at December 31, 2014
562,942

 
$
37.42

 
70,500

 
$
32.55

 
—

 
$
—

Awards granted
5,295

 
70.79

 
108,319

 
67.21

 
—

 
—

Awards vested
(261,504
)
 
33.74

 
(17,625
)
 
32.55

 
—

 
—

Awards forfeited/cancelled
106

 
36.57

 
(11,922
)
 
34.49

 
—

 
—

Unvested service-based awards outstanding at December 31, 2015
306,839

 
$
41.14

 
149,272

 
$
57.55

 
—

 
$
—

Awards granted
6,510

 
73.00

 
408,629

 
70.39

 
207,586

 
70.53

Awards vested
(156,535
)
 
42.64

 
(41,015
)
 
55.60

 
—

 
—

Awards forfeited/cancelled
(2,689
)
 
45.32

 
(31,698
)
 
70.44

 
(3,085
)
 
70.52

Unvested service-based awards outstanding at December 31, 2016
154,125

 
$
40.89

 
485,188

 
$
67.69

 
204,501

 
$
70.53
Performance-based Awards Activity
Summarized activity related to the Company’s performance-based awards for the years ended December 31, 2016, was as follows:
 
Equity-Classified
Equity-Settled
Restricted Stock
 
Liability-Classified
Equity-Settled
Restricted Stock
 
Equity-Classified
Equity-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 performance-based awards outstanding at January 1, 2014
—

 
$
—

 
—

 
$
—

 
—

 
$
—

Awards granted
26,441

 
38.91

 
360,617

 
38.13

 
—

 
—

Awards vested
—

 
—

 
—

 
—

 
—

 
—

Awards forfeited/cancelled
(2,550
)
 
36.57

 
—

 
—

 
—

 
—

Changes in the number of awards expected to be delivered
9,154

 
36.57

 
(22,152
)
 
18.32

 
—

 
—

Unvested performance-based awards outstanding at December 31, 2014
33,045

 
$
38.44

 
338,465

 
$
39.43

 
—

 
$
—

Awards granted
—

 
—

 
—

 
—

 
14,000

 
70.22

Awards vested
(12,145
)
 
39.92

 
(105,604
)
 
40.44

 
—

 
—

Awards forfeited/cancelled
(1,360
)
 
36.57

 
—

 
—

 
—

 
—

Changes in the number of awards expected to be delivered
2,550

 
36.57

 
(21,655
)
 
32.27

 
—

 
—

Unvested performance-based awards outstanding at December 31, 2015
22,090

 
$
37.52

 
211,206

 
$
39.65

 
14,000

 
$
70.22

Awards granted
—

 
—

 
—

 
—

 
—

 
—

Awards vested
(9,978
)
 
40.15

 
(105,604
)
 
40.44

 
(4,666
)
 
70.22

Awards forfeited/cancelled
(6,539
)
 
36.97

 
—

 
—

 
(4,667
)
 
70.22

Unvested performance-based awards outstanding at December 31, 2016
5,573

 
$
33.47

 
105,602

 
$
38.86

 
4,667

 
$
70.22