Rendering

Component: (Network and Table)
Network
2316301 - Disclosure - Share Based Compensation (Tables)
(http://www.amtrustgroup.com/role/ShareBasedCompensationTables)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Share-based Compensation [Abstract]Period [Axis]
2015-01-01 - 2015-12-31
Share-based Compensation [Abstract]
 
Schedule of Option Granted, Exercised and Expired
The following schedule shows all options granted, exercised, and expired under the Plan for the years ended December 31, 2015, 2014 and 2013:
 
2015
 
2014
 
2013
  
Shares
 
Weighted
Average
Exercise
Price
 
Shares
 
Weighted
Average
Exercise
Price
 
Shares
 
Weighted
Average
Exercise
Price
Outstanding at beginning of year
3,868,740

 
$
5.80

 
5,994,920

 
$
5.25

 
7,351,552

 
$
4.71

Granted
100,000

 
28.04

 
75,000

 
18.93

 
156,002

 
14.89

Exercised
(1,109,712
)
 
4.59

 
(2,184,240
)
 
4.75

 
(1,494,544
)
 
3.60

Forfeited
(75,148
)
 
9.17

 
(16,940
)
 
3.52

 
(18,090
)
 
4.45

Outstanding at end of year
2,783,880

 
$
6.99

 
3,868,740

 
$
5.80

 
5,994,920

 
$
5.25

 
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The per share fair value of options was estimated at the date of grant based on the following weighted average assumptions for the years ended December 31, 2015, 2014 and 2013:
 
2015
 
2014
 
2013
Volatility
40.81
%
 
41.72
%
 
33.50
%
Risk-free interest rate
1.97
%
 
2.62
%
 
1.01
%
Weighted average expected lives in years
6.25

 
6.25

 
6.25

Dividend rate
1.84
%
 
1.77
%
 
1.67
%
Forfeiture rate
0.50
%
 
0.50
%

0.50
%
 
 
Summary of Restricted Stock and RSU Activity
A summary of the Company’s restricted stock and RSU activity for the years ended December 31, 2015, 2014 and 2013 is shown below:
 
2015
 
2014
 
2013
  
Shares or
Units
 
Weighted
Average
Grant Date
Fair Value
 
Shares or
Units
 
Weighted
Average
Grant Date
Fair Value
 
Shares or
Units
 
Weighted Average
Grant Date Fair Value
Non-vested at beginning of year
2,611,022

 
$
16.70

 
1,834,030

 
$
12.22

 
1,776,394

 
$
10.43

Granted
476,942

 
29.27

 
1,804,716

 
19.60

 
582,860

 
15.59

Vested
(1,200,800
)
 
15.66

 
(995,068
)
 
13.69

 
(524,062
)
 
9.91

Forfeited
(33,648
)
 
20.95

 
(32,656
)
 
16.60

 
(1,162
)
 
14.65

Non-vested at end of year
1,853,516

 
$
20.54

 
2,611,022

 
$
16.70

 
1,834,030

 
$
12.22



A summary of the Company's PSU activity for the years ended December 31, 2015, 2014 and 2013 is shown below:

 
2015
 
2014
 
2013
  
Shares or
Units
 
Weighted
Average
Grant Date
Fair Value
 
Shares or
Units
 
Weighted
Average
Grant Date
Fair Value
 
Shares or
Units
 
Weighted Average
Grant Date Fair Value
Non-vested at beginning of year
549,670

 
$
19.42

 
318,906

 
$
14.67

 

 
$

Granted
373,628

 
29.93

 
338,150

 
22.60

 
319,426

 
14.67

Vested
(155,842
)
 
18.86

 
(79,420
)
 
14.67

 

 

Forfeited
(14,990
)
 
28.13

 
(27,966
)
 
17.20

 
(520
)
 
14.65

Non-vested at end of year
752,466

 
$
24.58

 
549,670

 
$
19.42

 
318,906

 
$
14.67