Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Expenses Associated with Share-Based Compensation Plans

The following table presents compensation expense associated with the Company’s share-based compensation plans:

 

 

Three Months Ended
March 31,

 

(in thousands)

 

2016

 

  

2015

 

Expense:

 

 

 

 

 

 

 

RSUs

$

14,981

 

 

$

10,102

 

Stock options

 

67

 

 

 

67

 

Employee stock purchase plan

 

810

  

  

 

689

  

 

$

15,858

  

  

$

10,858

  

 
Summary of RSU Activity

The following table summarizes RSU activity for the three months ended March 31, 2016:

 

(in thousands, except weighted-average grant-date fair value)

 

Shares

 

 

Weighted-average
grant-date

fair value

 

RSUs unvested at December 31, 2015

 

1,354

 

 

$

29.20

 

Granted during 2016

 

890

 

 

$

36.85

 

Vested during 2016

 

(655

)

 

$

30.95

 

Forfeited during 2016

 

(7

)

 

$

27.98

 

RSUs unvested at March 31, 2016

 

1,582

 

 

$

32.78

 

 
Summary of Stock Option Activity

The following table summarizes stock option activity for the three months ended March 31, 2016:

 

(in thousands, except weighted-average exercise price and contractual term)

 

Number

outstanding

 

 

Weighted-

average

exercise price

  

  

Weighted-

average

remaining

contractual term

   

  

Aggregate

intrinsic

value

 

Balance at December 31, 2015

 

132

 

 

$

27.66

 

 

 

 

 

 

 

 

 

Exercised during 2016

 

—

 

 

$

—

 

 

 

 

 

 

 

 

 

Balance at March 31, 2016

 

132

 

 

$

27.66

 

 

 

7.7 years

 

 

$

1,383

 

Vested and expected to vest at March 31, 2016

 

132

 

 

$

27.66

 

 

 

7.7 years

 

 

$

1,383

 

Exercisable at March 31, 2016

 

66

 

 

$

27.66

 

 

 

7.7 years

 

 

$

692