Stock Plans (Details 1) (Equity Incentive Plan Employee Stock Option [Member], USD $)	12 Months Ended
Dec. 31, 2011
Equity Incentive Plan Employee Stock Option [Member]
Stock option activity
Outstanding at January 1, 2011, Shares	2,661,299
Outstanding at January 1, 2011, Weighted Average Exercise Price	$ 27.73
Stock options granted	204,600
Granted, Weighted Average Exercise Price	$ 34.30
Exercised, Shares	(198,034)
Exercised, Weighted Average Exercise Price	$ 22.48
Canceled, Shares	(135,381)
Canceled, Weighted Average Exercise Price	$ 41.85
Outstanding at December 31, 2011, Shares	2,532,484
Outstanding at December 31, 2011, Weighted Average Exercise Price	$ 27.92
Exercisable at December 31, 2011, Shares	1,765,521
Exercisable at December 31, 2011, Weighted Average Exercise Price	$ 30.19

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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

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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

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

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-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

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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

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)(e)

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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

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

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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

No definition available.

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For presentations that combine terminations, the weighted average price of expired options and the 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

No definition available.

+ Details

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- Definition

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

+ References

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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 stock options awarded under the plan during the reporting period.

+ References

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

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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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-Publisher FASB

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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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