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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Option Activity
A summary of the Company’s stock option activity as of December 31, 2016, and changes during the year then ended, is presented below:
 
Number of
Shares
 
Option Price
Per Share
 
Weighted Average
Exercise Price
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at December 31, 2015
118,879

 
$2.89 –$24.65
 
$
16.23

 
 
Exercised
(15,333
)
 
22.17 –24.65
 
22.87

 
 
Outstanding at December 31, 2016
103,546

 
$2.89 –$22.17
 
$
15.24

 
$
1,388

Exercisable at December 31, 2016
103,546

 
$2.89 –$22.17
 
$
15.24

 
$
1,388
Summary of Restricted Stock Units
A summary of the status of the Company’s restricted stock units and restricted stock awards as of December 31, 2016, and changes during the year then ended, is presented below:
 
Non-Vested
Shares
 
Weighted Average
Grant Date
Fair Value
Non-vested at December 31, 2015
1,304,271

 
$
38.71

Awarded
712,841

 
$
27.16

Vested
(513,073
)
 
$
39.93

Cancelled/forfeited
(163,664
)
 
$
38.57

Non-vested at December 31, 2016
1,340,375

 
$
32.11