Share-Based Compensation Plans (Details 4) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding Ending Balance, Shares	1,269
Outstanding weighted average exercise price, Ending Balance	$ 58.03
Summary of employee stock purchase plan
Exercisable, Shares	486
Exercisable, weighted average exercise price	$ 48.21
Outstanding, weighted average remaining contractual term	6 years 3 months 18 days
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding Beginning Balance, Shares	0
Granted, Shares	150
Exercised, Shares	(150)
Forfeited or expired, Shares	0
Outstanding Ending Balance, Shares	0
Outstanding, weighted average exercise price, Beginning Balance	$ 0.00
Granted, weighted average exercise price	$ 82.27
Exercised, weighted average exercise price	$ 82.27
Forfeited or expired, weighted average exercise price	$ 0.00
Outstanding weighted average exercise price, Ending Balance	$ 0.00
Summary of employee stock purchase plan
Exercisable, Shares	0
Exercisable, weighted average exercise price	$ 0.00
Outstanding, weighted average remaining contractual term	0 years
Exercisable, weighted average remaining contractual term	0 years
Outstanding, Aggregate Intrinsic Value, of In-The-Money Options	$ 0
Exercisable, Aggregate Intrinsic Value of In-The-Money Options	$ 0

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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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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

-Paragraph 2

-Subparagraph (c)(1)(iii)

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently 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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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)-(4)

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Weighted average price of options that were either forfeited or expired.

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- Definition

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

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No definition available.

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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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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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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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

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