Share-Based Payment Arrangements (Summary of Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate Intrinsic Value, Cancelled/Forfeited
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding at Beginning	88,301
Number of Shares, Exercised/Released	(24,793)
Number of Shares, Cancelled/Forfeited
Number of Shares, Expired
Number of Shares, Outstanding at Ending	63,508	88,301
Number of Shares, Exercisable at Ending	63,508
Weighted Average Exercise Price, Outstanding at Beginning	$ 34.84
Weighted Average Exercise Price, Exercised/Released	35.12
Weighted Average Exercise Price, Cancelled/Forfeited
Weighted Average Exercise Price, Expired
Weighted Average Exercise Price, Outstanding at Ending	34.73	$ 34.84
Weighted Average Exercise Price, Exercisable at Ending	$ 34.73
Weighted Average Remaining Contractual Term (Years)	2 years 7 months 6 days	2 years 9 months 18 days
Weighted Average Remaining Contractual Term (Years), Exercisable at Ending	2 years 7 months 6 days
Aggregate Intrinsic Value, Outstanding at Beginning	$ 1,294
Aggregate Intrinsic Value, Exercised/Released	495
Aggregate Intrinsic Value, Outstanding at Ending	1,078	$ 1,294
Aggregate Intrinsic Value, Exercisable at Ending	$ 1,078

Share-Based Compensation Arrangements By Share-Based Payment Award, Options, Forfeitures, Intrinsic Value

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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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.

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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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 price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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

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