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STOCK-BASED COMPENSATION (Tables)
 3 Months Ended
Mar. 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 condensed consolidated statements of income and comprehensive income:
 
Three Months Ended 
 March 31,
 
2016
 
2015
Cost of revenues
$
3,644

 
$
2,484

Selling, general and administrative expenses - Acquisition related
3,010

 
4,492

Selling, general and administrative expenses - All other
4,310

 
2,158

Total
$
10,964

 
$
9,134
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, 2016
7,450,914

 
$
34.07

 
$
331,938

Options granted
284,383

 
70.50

 
1,186

Options exercised
(354,341
)
 
12.30

 
(22,100
)
Options forfeited/cancelled
(47,700
)
 
47.96

 
(1,274
)
Options outstanding at March 31, 2016
7,333,256

 
$
36.45

 
$
280,277

 
 
 
 
 
 
Options vested and exercisable at March 31, 2016
3,829,718

 
$
25.43

 
$
188,575

Options expected to vest
3,273,437

 
$
48.11

 
$
86,942
Service-based Awards Activity
Summarized activity related to the Company’s equity-classified and liability-classified service-based awards for the three months ended March 31, 2016, was as follows:
 
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, 2016
306,839

 
$
41.14

 
149,272

 
$
57.55

 
—

 
$
—

Awards granted
—

 
—

 
378,016

 
70.52

 
207,296

 
70.52

Awards vested
(4,957
)
 
17.37

 
(29,500
)
 
49.80

 
—

 
—

Awards forfeited/cancelled
(572
)
 
36.57

 
(1,672
)
 
66.77

 
(118
)
 
70.52

Unvested service-based awards outstanding at March 31, 2016
301,310

 
$
41.54

 
496,116

 
$
67.86

 
207,178

 
$
70.52
Performance-based Awards Activity
Summarized activity related to the Company’s performance-based awards for the three months ended March 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, 2016
22,090

 
$
37.52

 
211,206

 
$
39.65

 
14,000

 
$
70.22

Awards granted
—

 
—

 
—

 
—

 
—

 
—

Awards vested
(6,784
)
 
36.57

 
—

 
—

 
—

 
—

Awards forfeited/cancelled
(6,176
)
 
36.57

 
—

 
—

 
—

 
—

Unvested performance-based awards outstanding at March 31, 2016
9,130

 
$
38.87

 
211,206

 
$
39.65

 
14,000

 
$
70.22