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Stock-Based Compensation (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
	Mar. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Stock-Based Compensation [Abstract]
Options, Granted		1,100
Options, Exercised		(12,933)
Share Price		$ 28.95	$ 27.05	$ 27.45
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		12 months
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized		$ 40
Common Stock, Dividend Rate, Percentage	10.00%	10.00%

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- Definition

The percentage rate used to calculate dividend payments on common stock.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Gross number of share options (or share units) granted during the period.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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-Topic 820

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

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-Name Regulation S-X (SX)

-Number 210

-Section 04

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