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Stock Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Stock Activity The following table presents the restricted stock activity for the years ended December 31, 2018, 2017 and 2016 (in thousands, except per share amounts):
 
Number of Restricted Stock
 
Weighted Average
Grant Date
Fair Value
 
Total Intrinsic
Value of Restricted
Stock Vested
Outstanding at December 31, 2015
1,293

 
$
20.89

 
 
Granted (1)
1,048

 
$
22.46

 
 
Forfeited/Canceled
(353
)
 
$
21.04

 
 
Vested
(280
)
 
$
20.67

 
$
6,434

Outstanding at December 31, 2016
1,708

 
$
21.86

 
 
Granted
427

 
$
24.03

 
 
Forfeited/Canceled
(206
)
 
$
21.70

 
 
Vested (2)
(574
)
 
$
21.60

 
$
13,668

Outstanding at December 31, 2017
1,355

 
$
22.67

 
 
Granted
447

 
$
29.72

 
 
Forfeited/Canceled
(90
)
 
$
22.81

 
 
Vested
(392
)
 
$
23.03

 
$
11,935

Outstanding at December 31, 2018
1,320

 
$
18.19

 
 
(1)
The increase in shares granted during the year ended December 31, 2016 was due to a change in the grant date practice for our annual LTI awards. Kforce has historically granted these annual awards on the first business day of the year following the end of the performance period; however, for the performance period ending December 31, 2016 and thereafter, the grant date was shifted to the last day of the performance period. This administrative change resulted in two annual grants being made during the year ended December 31, 2016 (a grant on January 4, 2016 for the performance period ending December 31, 2015 and a grant on December 31, 2016 for the performance period ending December 31, 2016).
(2)
The increase in shares vested during the year ended December 31, 2017 was due to a shift in the vesting date of our outstanding annual LTI awards from January 2, 2018 and January 4, 2018 to December 31, 2017 as a tax planning strategy.