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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2017
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 2017, 2016 and 2015 is as follows:
 
 
Year ended December 31,
 
 
2017
 
2016
 
2015
 
 
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
 
649,012

 
$
14.65

 
1,006,171

 
$
14.92

 
1,351,802

 
$
14.89

Exercised
 
(222,921
)
 
14.88

 
(321,312
)
 
15.31

 
(323,486
)
 
14.86

Expired
 
(18,805
)
 
15.16

 
(34,947
)
 
16.32

 
(20,850
)
 
14.11

Forfeited
 
(975
)
 
13.99

 
(900
)
 
13.99

 
(1,295
)
 
14.68

Outstanding, end of year
 
406,311

 
$
14.51

 
649,012

 
$
14.65

 
1,006,171

 
$
14.92

 
 
 
 
 
 
 
 
 
 
 
 
 
Exercisable, end of year
 
406,311

 
$
14.51

 
593,224

 
$
14.72

 
824,365

 
$
14.95
Summary of non-vested share activity
As discussed above, during 2017 Employers Mutual began issuing restricted stock unit awards to eligible employees. These awards are accounted for as liability-based awards, whereby the liability is remeasured at each reporting date as the average of the high and low trading prices of the Company's common stock on that date. Upon settlement, the Company will receive the full fair value for all shares issued. The Company's share of this liability at December 31, 2017 was $543,000. A summary of restricted stock unit awards activity for 2017 is as follows:
 
 
Year ended December 31, 2017
 
 
Number of awards
Non-vested, beginning of year
 
—
 
Granted
 
116,288
 
Vested
 
—
 
Forfeited
 
2,233
 
Non-vested, end of year
 
114,055
 

For restricted stock awards, the average of the high and low trading prices of the Company's common stock on the dates of grant were used to determine their fair values. The Company received in 2016 and 2015 the full fair value, as of the grant date, for all shares issued in connection with Employers Mutual's grant of restricted stock awards.  At December 31, 2017, the Company’s portion of the unrecognized compensation cost associated with restricted stock awards that are not currently vested was $640,000 with a 1.56 year weighted-average period over which the compensation expense is expected to be recognized. The Company's portion of the total fair value of restricted stock awards that vested was $545,000, $414,000 and $233,000 in 2017, 2016 and 2015, respectively. A summary of restricted stock awards activity for 2017, 2016 and 2015 is as follows:
 
 
Year ended December 31,
 
 
2017
 
2016
 
2015
 
 
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
 
234,281

 
$
22.31

 
216,944

 
$
20.40

 
155,864

 
$
19.21

Granted
 
2,000

 
26.95

 
118,588

 
24.56

 
117,146

 
21.36

Vested
 
(85,192
)
 
21.31

 
(69,057
)
 
19.98

 
(40,941
)
 
18.99

Forfeited
 
(7,039
)
 
22.57

 
(32,194
)
 
22.73

 
(15,125
)
 
19.35

Non-vested, end of year
 
144,050

 
$
22.96

 
234,281

 
$
22.31

 
216,944

 
$
20.40
Summary of additional information relating to options outstanding and options vested (exercisable)
Additional information relating to options outstanding and options vested (exercisable) at December 31, 2017 is as follows:
 
 
December 31, 2017
($ in thousands, except share and per share amounts)
 
Number of options
 
Weighted-average exercise price
 
Aggregate intrinsic value
 
Weighted-average remaining term
Options outstanding
 
406,311

 
$
14.51

 
$
5,910

 
2.81
Options exercisable
 
406,311

 
$
14.51

 
$
5,910

 
2.81
Summary of employee stock purchase plan activity
During 2017, shares were purchased under the plan at prices ranging from $23.64 to $25.15.  Activity under the plan was as follows:
 
 
Year ended December 31,
 
 
2017
 
2016
 
2015
Shares available for purchase, beginning of year
 
349,404

 
414,883

 
471,459

Shares purchased under the plan
 
(77,819
)
 
(65,479
)
 
(56,576
)
Shares available for purchase, end of year
 
271,585

 
349,404

 
414,883
Summary of non-employee director stock option plan activity
During 2017, shares were purchased under the plan at prices ranging from $20.15 to $23.15.  Activity under the plan was as follows:
 
 
Year ended December 31,
 
 
2017
 
2016
 
2015
Shares available for purchase, beginning of year
 
249,843

 
264,446

 
279,809

Shares purchased under the plan
 
(14,470
)
 
(14,603
)
 
(15,363
)
Shares available for purchase, end of year
 
235,373

 
249,843

 
264,446
Summary of dividend reinvestment plan activity
Employers Mutual did not participate in this plan in 2017, 2016 or 2015.  Activity under the plan was as follows:
 
 
Year ended December 31,
 
 
2017
 
2016
 
2015
Shares available for purchase, beginning of year
 
971,222

 
976,697

 
982,227

Shares purchased under the plan
 
(5,421
)
 
(5,475
)
 
(5,530
)
Shares available for purchase, end of year
 
965,801

 
971,222

 
976,697

Lowest purchase price
 
$
26.94

 
$
22.09

 
$
21.02

Highest purchase price
 
$
31.09

 
$
30.50

 
$
26.43