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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2017
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,
 
 
2017
 
2016
 
2015
Cost of revenues
 
$
20,868

 
$
16,619

 
$
13,695

Selling, general and administrative expenses — Acquisition related
 
8,139

 
12,884

 
18,690

Selling, general and administrative expenses — All other
 
23,400

 
19,741

 
13,448

Total
 
$
52,407

 
$
49,244

 
$
45,833
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 
 
Weighted Average
Remaining Contractual Term (in years)
Options outstanding at January 1, 2015
6,838,746

 
$
20.98

 
$
183,073

 
 
Options granted
2,219,725

 
$
62.18

 
 
 
 
Options exercised
(1,405,826
)
 
$
14.70

 
 
 
 
Options forfeited/cancelled
(201,731
)
 
$
34.48

 
 
 
 
Options outstanding at December 31, 2015
7,450,914

 
$
34.07

 
$
331,938

 
 
Options granted
313,088

 
$
70.27

 
 
 
 
Options exercised
(895,804
)
 
$
20.13

 
 
 
 
Options forfeited/cancelled
(227,759
)
 
$
47.89

 
 
 
 
Options expired
(3,200
)
 
$
1.52

 
 
 
 
Options outstanding at December 31, 2016
6,637,239

 
$
37.20

 
$
179,936

 
 
Options granted
261,373

 
$
73.40

 
 
 
 
Options exercised
(1,789,434
)
 
$
30.23

 
 
 
 
Options forfeited/cancelled
(200,210
)
 
$
57.09

 
 
 
 
Options expired
(7,220
)
 
$
4.63

 
 
 
 
Options outstanding at December 31, 2017
4,901,748

 
$
40.91

 
$
326,064

 
6.2
 
 
 
 
 
 
 
 
Options vested and exercisable at December 31, 2017
3,068,917

 
$
31.49

 
$
233,054

 
5.5
Options expected to vest
1,764,538

 
$
56.35

 
$
90,133

 
7.3
Black-Scholes Model Valuation Assumptions
The grant-date fair value for stock options granted was determined using a Black-Scholes model incorporating the following average assumptions:
 
For the Years Ended December 31,
 
2017
 
2016
 
2015
Expected volatility
30.5
%
 
31.9
%
 
34.1
%
Expected term (in years)
6.25

 
6.24

 
6.25

Risk-free interest rate
2.1
%
 
1.5
%
 
1.8
%
Expected dividends
—
%
 
—
%
 
—
%
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, 2017, 2016 and 2015:
 
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, 2015
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

Awards granted
—

 
$
—

 
424,623

 
$
73.89

 
170,295

 
$
74.21

Awards modified
—

 
$
—

 
(2,570
)
 
$
26.85

 
2,570

 
$
73.27

Awards vested
(152,285
)
 
$
43.39

 
(140,043
)
 
$
66.54

 
(52,004
)
 
$
70.56

Awards forfeited/cancelled
—

 
$
—

 
(79,186
)
 
$
70.30

 
(10,533
)
 
$
71.72

Unvested service-based awards outstanding at December 31, 2017
1,840

 
$
54.37

 
688,012

 
$
71.60

 
314,829

 
$
72.50
Fair Value of Service-Based Awards Vested
The fair value of vested service-based awards (measured at the vesting date) for the years ended December 31, 2017, 2016 and 2015 was as follows:
 
For the Years Ended December 31,
 
2017
 
2016
 
2015
Equity-classified equity-settled
 
 
 
 
 
Restricted stock
$
12,607

 
$
11,431

 
$
19,305

Restricted stock units
10,620

 
2,932

 
1,092

Liability-classified cash-settled
 
 
 
 
 
Restricted stock units
3,811

 
—

 
—

Total fair value of vested service-based awards
$
27,038

 
$
14,363

 
$
20,397
Performance-Based Awards Activity
Summarized activity related to the Company’s performance-based awards for the years ended December 31, 2017, 2016 and 2015 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, 2015
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

Awards granted
—

 
$
—

 
—

 
$
—

 
—

 
$
—

Awards vested
(5,573
)
 
$
33.47

 
(105,602
)
 
$
38.86

 
—

 
$
—

Awards forfeited/cancelled
—

 
$
—

 
—

 
$
—

 
(4,667
)
 
$
70.22

Unvested performance-based awards outstanding at December 31, 2017
—

 
$
—

 
—

 
$
—

 
—

 
$
—
Fair Value of Performance-Based Awards Vested
The fair value of vested performance-based awards (measured at the vesting date) for the years ended December 31, 2017, 2016 and 2015 was as follows:
 
For the Years Ended December 31,
 
2017
 
2016
 
2015
Equity-classified equity-settled
 
 
 
 
 
Restricted stock
$
452

 
$
690

 
$
789

Restricted stock units
—

 
348

 
—

Liability-classified equity-settled
 
 
 
 
 
Restricted stock
8,633

 
7,955

 
7,363

Total fair value of vested performance-based awards
$
9,085

 
$
8,993

 
$
8,152