Employee Benefit Plans (Schedule of Employee Option Plan) (Details) (USD $)	6 Months Ended
Jun. 30, 2011
Employee Benefit Plans
Options, Outstanding at beginning of period	1,272,739
Options, Granted	494,885
Options, Exercised	(128,487)
Options, Forfeited	(27,819)
Options, Expired	(170)
Options, Outstanding at end of period	1,611,148
Weighted Average Exercise Price, Begining of the period	$ 38.77
Weighted Average Exercise Price, Granted	$ 61.51
Weighted Average Exercise Price, Exercised	$ (37.55)
Weighted Average Exercise Price, Forfeited	$ (48.54)
Weighted Average Exercise Price, Expired	$ (39.02)
Weighted Average Exercise Price, End of the period	$ 45.68

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- Definition

The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

+ References

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph A240
-Subparagraph b(1)(e)
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- Definition

The decrease in the number of shares that could be issued attributable to the lapse of rights to exercise previously issued stock options under the terms of the option agreements under the plan during the reporting period.

+ References

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- Definition

The weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that lapsed during the reporting period.

+ References

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- Definition

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
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- Definition

The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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-Subparagraph b(1)(d)
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- Definition

The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

+ References

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- Definition

The weighted average price as of the beginning of the year 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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- Definition

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

+ References

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