Stock Incentive Plans (Details 1) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Summary of stock options activity
Stock options shares at beginning of year	1,207
Stock option, Weighted Average Exercise Price Beginning balance	$ 39.45
Stock option, Weighted Average Remaining Contract Life (years) Beginning of year	8.0
Options granted, number of shares	289
Options granted, Weighted Average Exercise Price	$ 49.17
Options exercised, number of shares	(117)
Option exercised, Weighted Average Exercise Price	$ 37.68
Option exercised, Aggregate Intrinsic Value	1,686,000	550,000
Options terminated, number of shares	(6)
Option terminated, Weighted Average Exercise Price	$ 42.87
Stock options shares at End of year	1,373
Stock option, Weighted Average Exercise Price Ending balance	$ 41.63
Stock option, Weighted Average Remaining Contract Life (years) End of year	7.7
Stock options, Aggregate Intrinsic Value End of year	14,835,000
Options exercisable at end of period, Number of Shares	542
Options exercisable at end of period Weighted Average Exercise Price	$ 38.74
Options exercisable at end of period Weighted Average Remaining Contractual Life	6.1
Options exercisable at end of period Aggregate Intrinsic Value	$ 7,421,000
Weighted average fair value of options granted during the period	$ 9.60

Share Based Compensation Arrangement By Share Based Payment Award Options Cancelled In Period Weighted Average Exercise Price.

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: Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Aggregate Intrinsic Value

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term at the end of period

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Share Based Compensation Arrangement By Share Based Payment Award Options Exercised In Period Weighted Average Exercise Price.

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Share Based Compensation Arrangement By Share Based Payment Award Options Granted In Period Weighted Average Exercise Price.

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- Definition

Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average remaining contractual term, beginning of year.

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Summary Of Stock Options Outstanding And Exercised Under Various Stock Options Plans Abstract.

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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

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(1)(c), d(2)

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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 decrease in the number of reserved shares that could potentially be issued attributable to the exercise or conversion during the reporting period of previously issued stock options under the option plan.

+ References

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

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the 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

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
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-Subparagraph b(1)(f)

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The quantity of shares issuable on stock options awarded under the plan during the reporting period.

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-Name Statement of Financial Accounting Standard (FAS)
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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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-Name Statement of Financial Accounting Standard (FAS)
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- Definition

The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance-sheet date.

+ References

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph d(1)

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(1)(a)

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-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph b(1)(b)

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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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-Name Statement of Financial Accounting Standard (FAS)
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-Subparagraph b(1)(a)

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