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Share-Based Compensation Plans Stock Options (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price | $ / shares $ 37.73
Options Outstanding, Number, Beginning Balance | shares 33,000
Options Outstanding, Number, Ending Balance | shares 24,000 [1]
Options, Vested, Number | shares 24,000 [1]
Options, Exercisable, Number | shares 24,000 [1]
Options, Outstanding, Weighted Average Exercise Price, Beginning Balance | $ / shares $ 34.38
Expired unexercised | shares (9,000)
Options, Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares $ 33.13 [1]
Options, Vested, Weighted Average Exercise Price | $ / shares 33.13 [1]
Options, Exercisable, Weighted Average Exercise Price | $ / shares $ 33.13 [1]
Options, Outstanding, Weighted Average Remaining Contractual Term 1 year 2 months [1]
Options, Vested, Weighted Average Remaining Contractual Term 1 year 2 months [1]
Options, Exercisable, Weighted Average Remaining Contractual Term 1 year 2 months [1]
Options, Outstanding, Aggregate Intrinsic Value | $ $ 28,300 [1]
Options, Vested, Aggregate Intrinsic Value | $ 28,300 [1]
Options, Exercisable, Aggregate Intrinsic Value | $ $ 28,300 [1]
[1] All stock options outstanding at December 31, 2016 were vested and exercisable.