Share-Based Compensation (Significant Ranges of Outstanding and Exercisable Options) (Details) (USD $)	12 Months Ended
Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise prices, lower range limit	$ 9.10
Range of Exercise prices, upper range limit	$ 79.20
Options outstanding as of December 31, 2014	407,950
Weighted average remaining contractual life (years)	4 years 10 months 22 days
Weighted average exercise price	$ 22.12
Options exercisable as of December 31, 2014	266,411
Weighted average exercise price of exercisable options	$ 26.58
$9.10 - $10.55
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise prices, lower range limit	$ 9.10
Range of Exercise prices, upper range limit	$ 10.55
Options outstanding as of December 31, 2014	57,787
Weighted average remaining contractual life (years)	7 years 0 months 9 days
Weighted average exercise price	$ 9.80
Options exercisable as of December 31, 2014	40,148
Weighted average exercise price of exercisable options	$ 9.65
$13.32 - $13.60
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise prices, lower range limit	$ 13.32
Range of Exercise prices, upper range limit	$ 13.60
Options outstanding as of December 31, 2014	43,092
Weighted average remaining contractual life (years)	8 years 2 months 28 days
Weighted average exercise price	$ 13.44
Options exercisable as of December 31, 2014	10,204
Weighted average exercise price of exercisable options	$ 13.60
$14.51 - $14.51
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise prices, lower range limit	$ 14.51
Range of Exercise prices, upper range limit	$ 14.51
Options outstanding as of December 31, 2014	99,234
Weighted average remaining contractual life (years)	8 years 5 months 5 days
Weighted average exercise price	$ 14.51
Options exercisable as of December 31, 2014	8,409
Weighted average exercise price of exercisable options	$ 14.51
$15.53 - $23.80
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise prices, lower range limit	$ 15.53
Range of Exercise prices, upper range limit	$ 23.80
Options outstanding as of December 31, 2014	27,849
Weighted average remaining contractual life (years)	3 years 4 months 10 days
Weighted average exercise price	$ 23.06
Options exercisable as of December 31, 2014	27,849
Weighted average exercise price of exercisable options	$ 23.06
$25.00 - $25.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise prices, lower range limit	$ 25.00
Range of Exercise prices, upper range limit	$ 25.00
Options outstanding as of December 31, 2014	87,500
Weighted average remaining contractual life (years)	0 years 11 months 5 days
Weighted average exercise price	$ 25.00
Options exercisable as of December 31, 2014	87,500
Weighted average exercise price of exercisable options	$ 25.00
$27.60 - $33.20
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise prices, lower range limit	$ 27.60
Range of Exercise prices, upper range limit	$ 33.20
Options outstanding as of December 31, 2014	44,902
Weighted average remaining contractual life (years)	3 years 1 month 1 day
Weighted average exercise price	$ 28.69
Options exercisable as of December 31, 2014	44,902
Weighted average exercise price of exercisable options	$ 28.69
$34.60 - $52.60
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise prices, lower range limit	$ 34.60
Range of Exercise prices, upper range limit	$ 52.60
Options outstanding as of December 31, 2014	44,211
Weighted average remaining contractual life (years)	1 year 9 months 1 day
Weighted average exercise price	$ 47.12
Options exercisable as of December 31, 2014	44,024
Weighted average exercise price of exercisable options	$ 47.17
$57.40 - $64.80
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise prices, lower range limit	$ 57.40
Range of Exercise prices, upper range limit	$ 64.80
Options outstanding as of December 31, 2014	1,475
Weighted average remaining contractual life (years)	1 year 4 months 1 day
Weighted average exercise price	$ 62.21
Options exercisable as of December 31, 2014	1,475
Weighted average exercise price of exercisable options	$ 62.21
$73.20 - $73.20
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise prices, lower range limit	$ 73.20
Range of Exercise prices, upper range limit	$ 73.20
Options outstanding as of December 31, 2014	500
Weighted average remaining contractual life (years)	1 year 3 months 30 days
Weighted average exercise price	$ 73.20
Options exercisable as of December 31, 2014	500
Weighted average exercise price of exercisable options	$ 73.20
$79.20 - $79.20
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise prices, lower range limit	$ 79.20
Range of Exercise prices, upper range limit	$ 79.20
Options outstanding as of December 31, 2014	1,400
Weighted average remaining contractual life (years)	1 year 1 month 12 days
Weighted average exercise price	$ 79.20
Options exercisable as of December 31, 2014	1,400
Weighted average exercise price of exercisable options	$ 79.20

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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)(iii)

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

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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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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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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

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are 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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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=6415400&loc=d3e5070-113901

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