Equity (Summary of Stock Options by Exercise Price Range) (Details) (USD $)	12 Months Ended
Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	639,495
Options outstanding weighted average remaining contractual life	3 years 10 months 20 days
Options exercisable	253,990
$12.14 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum	12.14
Exercise price range, maximum	12.14
Number outstanding	57,440
Options outstanding weighted average remaining contractual life	1 year
Options exercisable	57,440
$13.45 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum	13.45
Exercise price range, maximum	13.45
Number outstanding	250
Options outstanding weighted average remaining contractual life	29 days
Options exercisable	250
$15.59 - $15.62 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum	15.59
Exercise price range, maximum	15.62
Number outstanding	100,370
Options outstanding weighted average remaining contractual life	2 years 11 months 23 days
Options exercisable	55,810
$17.07 - $17.94 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum	17.07
Exercise price range, maximum	17.94
Number outstanding	4,375
Options outstanding weighted average remaining contractual life	1 year 8 months 16 days
Options exercisable	2,000
$19.03 - $19.33 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum	19.03
Exercise price range, maximum	19.33
Number outstanding	203,410
Options outstanding weighted average remaining contractual life	3 years 1 month 17 days
Options exercisable	111,410
$21.76 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum	21.76
Exercise price range, maximum	21.76
Number outstanding	4,000
Options outstanding weighted average remaining contractual life	3 years 1 month 2 days
Options exercisable	1,000
$22.20 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum	22.20
Exercise price range, maximum	22.20
Number outstanding	4,000
Options outstanding weighted average remaining contractual life	4 years 1 month 2 days
Options exercisable	800
$27.80 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum	27.80
Exercise price range, maximum	27.80
Number outstanding	133,750
Options outstanding weighted average remaining contractual life	6 years
Options exercisable
$29.36 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum	29.36
Exercise price range, maximum	29.36
Number outstanding	2,000
Options outstanding weighted average remaining contractual life	4 years 8 months 8 days
Options exercisable
$32.12 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum	32.12
Exercise price range, maximum	32.12
Number outstanding	3,500
Options outstanding weighted average remaining contractual life	4 years 1 month 2 days
Options exercisable
$35.75 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, minimum	35.75
Exercise price range, maximum	35.75
Number outstanding	126,400
Options outstanding weighted average remaining contractual life	5 years
Options exercisable	25,280

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

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

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(iii)

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

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

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

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

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

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- Definition

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.

+ References

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