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Note 21: Stock Compensation Plans: Schedule of Share-based Compensation, Activity (Details) - Employee Stock Option | 12 Months Ended
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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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