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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 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 
 June 30,
 
Six Months Ended 
 June 30,
 
2016
 
2015
 
2016
 
2015
Cost of revenues
$
4,438

 
$
3,765

 
$
8,082

 
$
6,249

Selling, general and administrative expenses - Acquisition related
2,970

 
4,951

 
5,980

 
9,443

Selling, general and administrative expenses - All other
5,322

 
3,537

 
9,632

 
5,695

Total
$
12,730

 
$
12,253

 
$
23,694

 
$
21,387
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
291,112

 
70.58

 
(1,825
)
Options exercised
(666,024
)
 
18.92

 
(30,231
)
Options forfeited/cancelled
(158,486
)
 
46.05

 
(2,894
)
Options outstanding at June 30, 2016
6,917,516

 
$
36.79

 
$
190,370

 
 
 
 
 
 
Options vested and exercisable at June 30, 2016
3,536,211

 
$
25.47

 
$
137,346

Options expected to vest
3,180,340

 
$
48.26

 
$
51,044
Service-based Awards Activity
The table below summarizes activity related to the Company’s equity-classified and liability-classified service-based awards for the six months ended June 30, 2016.
 
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, 2016
306,839

 
$
41.14

 
149,272

 
$
57.55

 
—

 
$
—

Awards granted
4,925

 
76.18

 
386,205

 
70.50

 
207,586

 
70.53

Awards vested
(127,529
)
 
41.53

 
(31,348
)
 
50.80

 
—

 
—

Awards forfeited/cancelled
(582
)
 
36.57

 
(13,734
)
 
70.95

 
(1,372
)
 
70.52

Unvested service-based awards outstanding at June 30, 2016
183,653

 
$
41.82

 
490,395

 
$
67.80

 
206,214

 
$
70.53
Performance-based Awards Activity
Summarized activity related to the Company’s performance-based awards for the six months ended June 30, 2016, 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, 2016
22,090

 
$
37.52

 
211,206

 
$
39.65

 
14,000

 
$
70.22

Awards granted
—

 
—

 
—

 
—

 
—

 
—

Awards vested
(6,784
)
 
36.57

 
(105,604
)
 
40.44

 
(4,666
)
 
70.22

Awards forfeited/cancelled
(6,306
)
 
36.57

 
—

 
—

 
—

 
—

Unvested performance-based awards outstanding at June 30, 2016
9,000

 
$
38.90

 
105,602

 
$
38.86

 
9,334

 
$
70.22