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Long-term Equity-based Compensation Plans Schedule of Share-based Compensation, Nonemployee Director Deferred Stock Unit Award Plan, Activity (Details) | 9 Months Ended
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Sep. 30, 2015 USD ($) $ / shares shares
Schedule of Share-based Compensation, Nonemployee Director Deferred Stock Unit Award Plan [Abstract] |
Share-based Compensation Arrangement by Share-based Payment Award, Deferred Stock Units, Outstanding, Number, Beginning of Year | shares | 8,000
Share-based Compensation Arrangement by Share-based Payment Award, Deferred Stock Units, Outstanding, Weighted Average Exercise Price, Beginning of Year | $ 34.52
Share-based Compensation Arrangement by Share-based Payment Award, Deferred Stock Units, Granted and Vested in Period | shares | 3,500
Share-based Compensation Arrangements by Share-based Payment Award, Deferred Stock Units, Granted and Vested in Period, Weighted Average Exercise Price | $ 38.38
Share-based Compensation Arrangements by Share-based Payment Award, Deferred Stock Units, Reduction for Shares Issued on Conversion | $ | $ (4,500)
Share-based Compensation Arrangements by Share-based Payment Award, Deferred Stock Units, Reduction for Shares Issued on Conversion, Weighted Average Exercise Price | $ 34.94
Share-based Compensation Arrangements by Share-based Payment Award, Deferred Stock Units, Forfeited | $ | $ 0
Share-based Compensation Arrangements by Share-based Payment Award, Deferred Stock Units, Forfeited, Weighted Average Exercise Price | $ | $ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Deferred Stock Units, Outstanding, Number, End of Period | shares | 7,000
Share-based Compensation Arrangement by Share-based Payment Award, Deferred Stock Units, Outstanding, Weighted Average Exercise Price, End of Period | $ 36.17

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