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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Costs Related to Company's Stock-Based Compensation Plan
The following costs related to the Company’s stock-based compensation plan are included in the consolidated statements of income:
 
Year ended December 31,
 
2015
 
2014
 
2013
Cost of revenue
$
2,895

 
$
2,290

 
$
2,413

General and administrative expenses
6,077

 
4,350

 
5,077

Selling and marketing expenses
7,075

 
4,371

 
4,342

Total
$
16,047

 
$
11,011

 
$
11,832
Stock Based Compensation Stock Option Activity
Stock option activity under the Company’s stock plans is shown below:

Number of
Options
 
Weighted-
Average
Exercise
Price
 
Aggregate
Intrinsic
Value
 
Weighted-
Average
Remaining
Contractual
Life (Years)
Outstanding at December 31, 2012
2,454,634

 
$
15.30

 

 

  Granted
14,301

 
26.76

 

 

  Exercised
(485,141
)
 
11.32

 

 

  Forfeited
(27,279
)
 
24.13

 

 

Outstanding at December 31, 2013
1,956,515

 
$
16.25

 

 

  Granted
9,794

 
27.62

 

 

  Exercised
(440,380
)
 
14.67

 

 

  Forfeited
(92,750
)
 
25.20

 

 

Outstanding at December 31, 2014
1,433,179

 
$
16.23

 
 
 
 
  Granted
—

 
—

 

 

  Exercised
(216,980
)
 
15.55

 

 

  Forfeited
(6,058
)
 
24.77

 

 

Outstanding at December 31, 2015
1,210,141

 
$
16.31

 
$
34,638

 
3.50
Vested and exercisable at December 31, 2015
1,135,278

 
$
15.75

 
$
33,130

 
3.33
Company's Stock Options Outstanding and Stock Options Vested and Exercisable
The following table summarizes the status of the Company’s stock options outstanding and stock options vested and exercisable at December 31, 2015:
 
Options Outstanding
 
Options Vested and Exercisable
Range of Exercise Prices
Shares
 
Weighted-
Average
Exercise Price
 
Shares
 
Weighted-
Average
Exercise Price
$8.00 to $15.00
546,543

 
$
10.06

 
546,543

 
$
10.06

$15.01 to $21.00
322,661

 
18.33

 
322,661

 
18.33

$21.01 to $28.00
340,937

 
24.41

 
266,074

 
24.30

Total
1,210,141

 
$
16.31

 
1,135,278

 
$
15.75
Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Stock Activity Under Company's Stock Plans
Restricted stock and restricted stock unit activity under the Company’s stock plans is shown below:
 
Restricted Stock
 
Restricted Stock Units
 
Number
 
Weighted-
Average
Intrinsic Value
 
Number
 
Weighted-
Average
Intrinsic Value
Outstanding at December 31, 2012
5,207

 
$
17.58

 
1,025,911

 
$
21.36

Granted
—

 
—

 
522,130

 
29.37

Vested
(4,807
)
 
17.56

 
(300,316
)
 
20.35

Forfeited
(400
)
 
17.72

 
(103,283
)
 
25.04

Outstanding at December 31, 2013
—

 
$
—

 
1,144,442

 
$
24.95

Granted
46,950

 
29.29

 
634,054

 
26.26

Vested
—

 
—

 
(436,660
)
 
22.04

Forfeited
—

 
—

 
(152,145
)
 
26.28

Outstanding at December 31, 2014*
46,950

 
$
29.29

 
1,189,691

 
$
26.54

Granted
122,131

 
35.91

 
471,160

 
34.99

Vested
(34,147
)
 
29.29

 
(348,086
)
 
25.24

Forfeited
(5,296
)
 
29.29

 
(84,478
)
 
27.89

Outstanding at December 31, 2015*
129,638

 
$
35.53

 
1,228,287

 
$
30.06

 
 
 
 
 
*     Excludes 21,364 and 28,000 restricted stock units vested during the years ended December 31, 2015 and 2014, respectively. As of December 31, 2015 and 2014 restricted stock units vested for which the underlying common stock is yet to be issued are 149,364 and 128,000, respectively.
Performance Based Stock Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted Stock Activity Under Company's Stock Plans
Performance restricted stock unit activity under the Company’s stock plans is shown below:
 
Revenue Based PRSUs
 
Market Condition Based PRSUs
 
Number
 
Weighted Avg
Fair Value
 
Number
 
Weighted Avg
Fair Value
Outstanding at December 31, 2014
47,725

 
$
25.63

 
47,725

 
$
33.60

Granted
62,788

 
34.75

 
162,787

 
40.36

Vested
—

 
—

 
—

 
—

Forfeited
(3,300
)
 
28.53

 
(3,300
)
 
40.29

Outstanding at December 31, 2015
107,213

 
$
30.88

 
207,212

 
$
38.80