Stock-Based Compensation (Options Outstanding & Exercisable) (Details) (USD $)	12 Months Ended
Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	2,792
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 25.41
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding Shares, Beginning Balance	57,094
Expired	15,725
Outstanding Shares, Ending Balance	38,577
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Options Outstanding, Weighted Average Exercise Price	$ 27.96
Options Expired, Weighted Average Exercise Price	$ 28.08
Options Outstanding, Weighted Average Exercise Price	$ 28.09
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options Outstanding, Weighted Average Remaining Contractual Term	0 years 9 months
Options Outstanding, Intrinsic Value	$ 0
Options Exercisable	38,577
Options Exercisable, Weighted Average Exercise Price	$ 28.09
Options Exercisable, Weighted Average Remaining Contractual Term	0 years 9 months
Options Exercisable, Intrinsic Value	$ 0
Options Outstanding & Exercisable, Common Shares Subject to Options Outstanding	38,577.000
Options Outstanding & Exercisable, Weighted-Average Remaining Contractual Life	0 years 9 months
Options Outstanding & Exercisable, Weighted-Average Exercise Price (usd per share)	$ 28.09
Range of Exercise Price $26.01 - $27.74
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options Outstanding & Exercisable, Range of Exercise Prices, Lower Range Limit	$ 26.01
Options Outstanding & Exercisable, Range of Exercise Prices, Upper Range Limit	$ 27.74
Options Outstanding & Exercisable, Common Shares Subject to Options Outstanding	13,680
Options Outstanding & Exercisable, Weighted-Average Remaining Contractual Life	0 years 2 months
Options Outstanding & Exercisable, Weighted-Average Exercise Price (usd per share)	$ 26.86
Range of Exercise Price $28.25 - $28.26
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options Outstanding & Exercisable, Range of Exercise Prices, Lower Range Limit	$ 28.25
Options Outstanding & Exercisable, Range of Exercise Prices, Upper Range Limit	$ 28.26
Options Outstanding & Exercisable, Common Shares Subject to Options Outstanding	13,697
Options Outstanding & Exercisable, Weighted-Average Remaining Contractual Life	1 year 1 month
Options Outstanding & Exercisable, Weighted-Average Exercise Price (usd per share)	$ 28.25
Range of Exercise Price $28.57 - $30.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options Outstanding & Exercisable, Range of Exercise Prices, Lower Range Limit	$ 28.57
Options Outstanding & Exercisable, Range of Exercise Prices, Upper Range Limit	$ 30
Options Outstanding & Exercisable, Common Shares Subject to Options Outstanding	11,200
Options Outstanding & Exercisable, Weighted-Average Remaining Contractual Life	1 year 3 months
Options Outstanding & Exercisable, Weighted-Average Exercise Price (usd per share)	$ 29.40

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Number of share options (or share units) exercised during the current period.

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