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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of the activity under Employers Mutual's stock option plans
A summary of the stock option activity under Employers Mutual’s stock plans for 2015, 2014 and 2013 is as follows:
 
 
Year ended December 31,
 
 
2015
 
2014
 
2013
 
 
Number
of
options
 
Weighted-
average
exercise
price
 
Number
of
options
 
Weighted-
average
exercise
price
 
Number
of
options
 
Weighted-
average
exercise
price
Outstanding, beginning of year
 
1,351,802

 
$
14.89

 
1,702,938

 
$
14.78

 
2,383,578

 
$
14.59

Exercised
 
(323,486
)
 
14.86

 
(300,479
)
 
14.24

 
(609,808
)
 
14.18

Expired
 
(20,850
)
 
14.11

 
(34,421
)
 
15.01

 
(70,832
)
 
13.57

Forfeited
 
(1,295
)
 
14.68

 
(16,236
)
 
15.29

 
—

 
—

Outstanding, end of year
 
1,006,171

 
$
14.92

 
1,351,802

 
$
14.89

 
1,702,938

 
$
14.78

 
 
 
 
 
 
 
 
 
 
 
 
 
Exercisable, end of year
 
824,365

 
$
14.95

 
963,831

 
$
14.94

 
1,036,650

 
$
14.91
Summary of non-vested share activity
At December 31, 2015, the Company’s portion of the unrecognized compensation cost associated with restricted stock awards issued under Employers Mutual’s stock plans that are not currently vested was $983,000, with a 2.52 year weighted-average period over which the compensation expense is expected to be recognized.  A summary of non-vested restricted stock activity under Employers Mutual’s stock plans for 2015, 2014 and 2013 is as follows:
 
 
Year ended December 31,
 
 
2015
 
2014
 
2013
 
 
Number
of
awards
 
Weighted-
average
grant-date
fair value
 
Number
of
awards
 
Weighted-
average
grant-date
fair value
 
Number
of
awards
 
Weighted-
average
grant-date
fair value
Non-vested, beginning of year
 
155,864

 
$
19.21

 
85,002

 
$
17.27

 
—

 
$
—

Granted
 
117,146

 
21.36

 
94,146

 
20.49

 
86,580

 
17.27

Vested
 
(40,941
)
 
18.99

 
(21,223
)
 
17.27

 
—

 
—

Forfeited
 
(15,125
)
 
19.35

 
(2,061
)
 
17.74

 
(1,578
)
 
17.27

Non-vested, end of year
 
216,944

 
$
20.40

 
155,864

 
$
19.21

 
85,002

 
$
17.27
Summary of additional information relating to options outstanding and options vested (exercisable)
The Company’s portion of the total intrinsic value of options exercised under Employers Mutual’s stock plans was $770,000, $606,000 and $844,000 in 2015, 2014 and 2013, respectively.  Under the terms of the pooling and quota share agreements, these amounts were paid to Employers Mutual.  The Company receives the full fair value, as of the exercise date, for all shares issued in connection with option exercises. The Company also receives the full fair value, as of the grant date, for all shares issued in connection with the grant of restricted stock awards.  The Company's portion of the total fair value of restricted stock awards that vested was $233,000 and $110,000 in 2015 and 2014, respectively (no restricted stock awards vested prior to 2014). Additional information relating to options outstanding and options vested (exercisable) at December 31, 2015 is as follows:
 
 
December 31, 2015
($ in thousands)
 
Number of options
 
Weighted-average exercise price
 
Aggregate intrinsic value
 
Weighted-average remaining term
Options outstanding
 
1,006,171

 
$
14.92

 
$
10,836

 
3.96
Options exercisable
 
824,365

 
$
14.95

 
$
8,850

 
3.55
Summary of employee stock purchase plan activity
During 2015, shares were purchased under the plan at prices ranging from $18.75 to $21.40.  Activity under the plan was as follows:
 
 
Year ended December 31,
 
 
2015
 
2014
 
2013
Shares available for purchase, beginning of year
 
471,459

 
508,749

 
555,600

Shares purchased under the plan
 
(56,576
)
 
(37,290
)
 
(46,851
)
Shares available for purchase, end of year
 
414,883

 
471,459

 
508,749
Summary of non-employee director stock option plan activity
During 2015, shares were purchased under the plan at prices ranging from $15.51 to $18.26.  Activity under the plan was as follows:
 
 
Year ended December 31,
 
 
2015
 
2014
 
2013
Shares available for purchase, beginning of year
 
279,809

 
294,248

 
224,106

Shares registered for use in the 2013 plan
 
—

 
—

 
300,000

Shares deregistered under the 2003 plan
 
—

 
—

 
(222,306
)
Shares purchased under the plan
 
(15,363
)
 
(14,439
)
 
(7,552
)
Shares available for purchase, end of year
 
264,446

 
279,809

 
294,248
Summary of dividend reinvestment plan activity
Employers Mutual did not participate in this plan in 2015, 2014 or 2013.  Activity under the plan was as follows:
 
 
Year ended December 31,
 
 
2015
 
2014
 
2013
Shares available for purchase, beginning of year
 
982,227

 
988,436

 
—

Shares registered for use in the plan
 
—

 
—

 
991,778

Shares purchased under the plan
 
(5,530
)
 
(6,209
)
 
(3,342
)
Shares available for purchase, end of year
 
976,697

 
982,227

 
988,436

Lowest purchase price
 
$
21.02

 
$
18.69

 
$
18.74

Highest purchase price
 
$
26.43

 
$
23.59

 
$
20.98