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Share Based Compensation (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
201820172016
Stock options$1,053$958$848
Nonvested restricted stock awards and restricted stock units2,4592,9353,121
Employee stock purchase plan898887
Non-elective and elective 401(k) matching contribution in stock722,124
Director stock ownership plan123137169
Total share-based compensation expense$3,724$4,190$6,349
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
Weighted Weighted
AverageAverage
Exercise RemainingAggregate
Number ofPrice ContractualIntrinsic
Options(per option)Term (years)Value
Options outstanding as of January 1, 2018111,255$97.71
Options granted35,842151.75
Options exercised(25,025)83.96
Options outstanding as of December 31, 2018122,072$116.395.0$7,185
Options expected to vest after December 31, 201886,635$125.485.3$4,312
Options exercisable as of December 31, 201835,437$94.174.2$2,873
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
Weighted
AverageWeightedWeighted
NumberRemainingAverageNumberAverage
Range ofof OptionsContractualExercise Priceof OptionsExercise Price
Exercise PricesOutstandingTerm (years)(per option)Exercisable(per option)
$50.01 -$60.00 8741.258.2687458.26
$60.01 -$70.00
$70.01 -$80.00 42,2724.172.1919,79172.26
$80.01 -$90.00 2,7973.287.302,79787.30
$90.01 -$130.00
$130.01 -$140.00 40,2875.2134.6011,975134.60
$140.01 -$150.00
$150.01 -$160.00 35,8426.2151.75
122,0725.0116.3935,43794.17
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
2018201720162015
Number of stock options granted35,84242,47767,44438,698
Dividend yield1.37%1.49%1.49%1.55%
Expected volatility24.73%25.52%28.39%36.32%
Risk-free interest rate2.54%1.67%1.08%1.22%
Expected term (years)4.04.04.04.0
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
201820172016
2018 Stock option awards$310$$
2017 Stock option awards$367$308$
2016 Stock option awards$332$332$282
2015 Stock option awards$44$276$276
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
Weighted
Average Grant
Number ofDate Fair Value
Shares(per share)
Nonvested awards, December 31, 201772,164$91.03
Granted16,166$152.38
Vested(34,954)$87.08
Forfeited(591)$121.43
Nonvested awards, December 31, 201852,785$112.09
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
Weighted
Average Grant
Number ofDate Fair Value
Units(per unit)
Nonvested awards, December 31, 20174,277$95.53
Granted1,549$153.84
Vested(1,176)$87.30
Nonvested awards, December 31, 20184,650$117.03