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STOCK-BASED COMPENSATION (Tables)
 3 Months Ended
Mar. 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 condensed consolidated statements of income and comprehensive income:
 
Three Months Ended 
 March 31,
 
2017
 
2016
Cost of revenues
$
5,350

 
$
3,644

Selling, general and administrative expenses - Acquisition related
4,574

 
3,010

Selling, general and administrative expenses - All other
5,852

 
4,310

Total
$
15,776

 
$
10,964
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, 2017
6,637,239

 
$
37.20

 
$
179,936

Options granted
234,990

 
73.27

 
529

Options exercised
(486,524
)
 
27.92

 
(23,159
)
Options forfeited/cancelled
(75,456
)
 
57.87

 
(1,332
)
Options outstanding at March 31, 2017
6,310,249

 
$
39.06

 
$
230,072

 
 
 
 
 
 
Options vested and exercisable at March 31, 2017
4,302,714

 
$
30.84

 
$
192,245

Options expected to vest
1,891,705

 
$
56.33

 
$
36,302
Service-based Awards Activity
The table below summarizes activity related to the Company’s equity-classified and liability-classified service-based awards for the three months ended March 31, 2017.
 
Equity-Classified
 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, 2017
154,125

 
$
40.89

 
485,188

 
$
67.69

 
204,501

 
$
70.53

Awards granted
—

 
—

 
380,577

 
73.27

 
138,584

 
73.27

Awards modified
—

 
—

 
(2,570
)
 
48.49

 
2,570

 
73.27

Awards vested
(1,437
)
 
20.64

 
(116,183
)
 
65.32

 
(51,928
)
 
70.56

Awards forfeited/cancelled
—

 
—

 
(19,036
)
 
67.45

 
(616
)
 
70.52

Unvested service-based awards outstanding at March 31, 2017
152,688

 
$
41.08

 
727,976

 
$
71.06

 
293,111

 
$
71.84
Performance-based Awards Activity
Summarized activity related to the Company’s performance-based awards for the three months ended March 31, 2017, was as follows:
 
Equity-Classified
 Restricted Stock
 
Liability-Classified
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, 2017
5,573

 
$
33.47

 
105,602

 
$
38.86

 
4,667

 
$
70.22

Awards granted
—

 
—

 
—

 
—

 
—

 
—

Awards vested
(2,552
)
 
36.57

 
—

 
—

 
—

 
—

Awards forfeited/cancelled
—

 
—

 
—

 
—

 
—

 
—

Unvested performance-based awards outstanding at March 31, 2017
3,021

 
$
30.85

 
105,602

 
$
38.86

 
4,667

 
$
70.22