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Compensation Plans (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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