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Equity (Details 5)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	730,980
Options outstanding weighted average remaining contractual life	3 years 10 months 10 days
Options exercisable	299,745
Exercise Price Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	77,960
Options outstanding weighted average remaining contractual life	1 year
Options exercisable	77,960
Exercise price range, minimum | $ / shares	$ 19.33
Exercise Price Range Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	2,800
Options outstanding weighted average remaining contractual life	1 year 29 days
Options exercisable	2,000
Exercise price range, minimum | $ / shares	$ 22.20
Exercise Price Range Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	117,540
Options outstanding weighted average remaining contractual life	4 years
Options exercisable	45,150
Exercise price range, minimum | $ / shares	$ 23.61
Exercise Price Range Four [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	13,000
Options outstanding weighted average remaining contractual life	2 years 10 months 6 days
Options exercisable	5,500
Exercise price range, minimum | $ / shares	$ 25.29
Exercise price range, maximum | $ / shares	$ 28.82
Exercise Price Range Five [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	4,000
Options outstanding weighted average remaining contractual life	3 years 29 days
Options exercisable	1,000
Exercise price range, minimum | $ / shares	$ 26.40
Exercise Price Range Six [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	102,600
Options outstanding weighted average remaining contractual life	3 years
Options exercisable	59,120
Exercise price range, minimum | $ / shares	$ 27.80
Exercise Price Range Seven [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	2,000
Options outstanding weighted average remaining contractual life	1 year 8 months 5 days
Options exercisable	1,500
Exercise price range, minimum | $ / shares	$ 29.36
Exercise Price Range Eight [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	137,900
Options outstanding weighted average remaining contractual life	4 years 11 months 5 days
Options exercisable	28,955
Exercise price range, minimum | $ / shares	$ 32.12
Exercise price range, maximum | $ / shares	$ 32.83
Exercise Price Range Nine [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	4,000
Options outstanding weighted average remaining contractual life	4 years 1 month 2 days
Options exercisable
Exercise price range, minimum | $ / shares	$ 33.95
Exercise Price Range Ten [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	99,580
Options outstanding weighted average remaining contractual life	2 years
Options exercisable	78,560
Exercise price range, minimum | $ / shares	$ 35.75
Exercise Price Range Eleven [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	2,000
Options outstanding weighted average remaining contractual life	4 years 8 months 12 days
Options exercisable
Exercise price range, minimum | $ / shares	$ 40.15
Exercise Price Range Twelve [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	167,600
Options outstanding weighted average remaining contractual life	6 years
Options exercisable
Exercise price range, minimum | $ / shares	$ 43.80

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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=96867065&loc=d3e5070-113901

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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.

+ 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=96867065&loc=d3e5070-113901

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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=96867065&loc=d3e5070-113901

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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.

+ 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=96867065&loc=d3e5070-113901

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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.

+ 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=96867065&loc=d3e5070-113901

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