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Stock-Based Compensation (Options Outstanding) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stock-Based Compensation [Abstract]
Options Outstanding (shares)	175,620	378,990	507,783
Vested or expected to vest (shares)	175,620
Options exercisable (shares)	175,620	341,194
Weighted-Average Remaining Contractual Term, Options Outstanding (in years)	4 years 2 months 12 days
Weighted-Average Remaining Contractual Term, Vested or expected to vest (in years)	4 years 2 months 12 days
Weighted-Average Remaining Contractual Term, Options exercisable (in years)	4 years 2 months 12 days
Weighted Average Exercise Price, Options outstanding (per share)	$ 25.13	$ 24.32	$ 24.80
Weighted Average Exercise Price, Vested or expected to vest (per share)	25.13
Weighted-Average Exercise Price, Options exercisable (per share)	$ 25.13	$ 24.18
Aggregate Intrinsic Value, Options outstanding
Aggregate Intrinsic Value, Vested or expected to vest
Aggregate Intrinsic Value, Options 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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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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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 the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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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 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 remaining contractual term for fully vested and expected to vest options that are 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 fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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