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Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding Long Term Incentive Awards [Table Text Block]
Information related to the outstanding grants at December 31, 2017 is shown below:

(in thousands, except share and per share data)

2016 - 2018 Cycle
 
2017 - 2019 Cycle
Shares issuable at target
87,758

 
55,203

Maximum shares issuable
107,955

 
68,263

Unrecognized compensation cost
$
949

 
$
1,792

Weighted average grant date fair value
25.26

 
40.72
Summary of Employee Stock Option and SSARs Activity
Following is a summary of the employee stock option and SSAR activity for 2017.

(in thousands, except share and per share data)
Shares
 
Weighted
Average
Exercise Price
 
Weighted
Average
Remaining
Contractual Term
 
Aggregate
Intrinsic Value
Outstanding at December 31, 2016
270,246

 
$
18.85

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(164,116
)
 
22.40

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Outstanding at December 31, 2017
106,130

 
$
13.37

 
1.9 years
 
$
3,373

Exercisable at December 31, 2017
106,130

 
$
13.37

 
1.9 years
 
$
3,373
Summary of Restricted Stock Units Activity
A summary of the status of the Company's RSU awards as of December 31, 2017 and changes during the year then ended is presented below.
 
Shares
 
Weighted Average
Grant Date
Fair Value
Outstanding at December 31, 2016
58,698

 
$
23.06

Granted
16,462

 
41.68

Vested
(33,206
)
 
18.48

Forfeited
(732
)
 
14.48

Outstanding at December 31, 2017
41,222

 
$
34.34
Stock Options and SSARs  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Various Information
Various information related to the stock options and SSARs is shown below.

(in thousands)
2017
 
2016
 
2015
Compensation expense
$
—

 
$
—

 
$
50

Intrinsic value of option exercises on date of exercise
3,156

 
1,156

 
74

Cash received from the exercise of stock options
91

 
87

 
126
Restricted Stock Units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Various Information
Various information related to the RSUs is shown below.

($ in thousands)
2017
 
2016
 
2015
Compensation expense
$
898

 
$
850

 
$
725

Total fair value at vesting date
1,471

 
2,275

 
809

Total unrecognized compensation cost for nonvested stock units
837

 
1,084

 
942

Expected years to recognize unearned compensation
1.8 years

 
1.6 years

 
1.7 years
Stock Plan for Non-Management Directors  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Various Information
Various information related to the Director Plan is shown below.

(in thousands, except share and per share data)
2017
 
2016
 
2015
Shares issued
10,531

 
12,528

 
16,283

Weighted average fair value
$
42.46

 
$
31.25

 
$
24.43

Compensation expense
397

 
407

 
373