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Note 21: Stock Compensation Plans: Schedule of Share-based Compensation, Activity (Details) - Employee Stock Option	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Options Outstanding | Beginning of Period
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares	661,203
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares	$ 33.672
Share based compensation stock option weighted average remaining contractual term	7.23 years
Options Outstanding | End of Period
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares	682,799
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares	$ 38.860
Share based compensation stock option weighted average remaining contractual term	7.38 years
Granted
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares	157,800
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares	$ 52.118
Exercised
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares	(119,692)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares	$ 27.352
Forfeited
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares	(16,512)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares	$ 41.212
Options Exercisable
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares	240,862
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares	$ 27.884
Share based compensation stock option weighted average remaining contractual term	5.20 years

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+ 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 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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