Stock-Based Compensation Plans (Details) (USD $)	3 Months Ended
Mar. 31, 2015
Shares
Exercised (in shares)	(17,002)
2009 Plan \| Stock Options
Shares
Options outstanding at the beginning of the period (in shares)	340,062
Exercised (in shares)	(12,527)
Forfeited (in shares)	0
Options outstanding at the end of the period (in shares)	327,535
Options exercisable at the end of the period (in shares)	266,121
Weighted average exercise price per share
Options outstanding at the beginning of the period (in dollars per share)	122.67
Exercised (in dollars per share)	123.43
Forfeited (in dollars per share)	0.00
Options outstanding at the end of the period (in dollars per share)	122.64
Options exercisable at the end of the period (in dollars per share)	121.18
1994 Plan \| Stock Options
Shares
Options outstanding at the beginning of the period (in shares)	272,402
Exercised (in shares)	(4,475)
Forfeited (in shares)	0
Options outstanding at the end of the period (in shares)	267,927
Options exercisable at the end of the period (in shares)	267,927
Weighted average exercise price per share
Options outstanding at the beginning of the period (in dollars per share)	104.96
Exercised (in dollars per share)	141.79
Forfeited (in dollars per share)	0.00
Options outstanding at the end of the period (in dollars per share)	104.35
Options exercisable at the end of the period (in dollars per share)	104.35

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.

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 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.

+ References

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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Number of options outstanding, including both vested and non-vested options.

+ References

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

-Publisher FASB

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

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-Publisher FASB

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

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-Section 04

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