Stock Plans (Details 4) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Weighted-Average Grant-Date Fair Value
Dividends expected to be paid	$ 0
Total grant date fair value of shares vested	$ 6,200,000	$ 7,900,000	$ 5,400,000
Restricted Stock Awards and Restricted Stock Units
Restricted stock awards including restricted stock units, Shares
Outstanding at the beginning of the period (in shares)	1,158	693	618
Granted (in shares)	395	798	324
Released (in shares)	(183)	(207)	(167)
Forfeitures (in shares)	(133)	(126)	(82)
Outstanding at the end of the period (in shares)	1,237	1,158	693
Weighted-Average Grant-Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 34.93	$ 36.11	$ 33.61
Granted (in dollars per share)	$ 34.18	$ 33.16	$ 32.62
Released (in dollars per share)	$ 38.65	$ 32.44	$ 20.60
Forfeitures (including cancelled awards) (in dollars per share)	$ 33.66	$ 34.33	$ 34.98
Outstanding at the end of the period (in dollars per share)	$ 34.27	$ 34.93	$ 36.11
Restricted Stock Awards \| Minimum
Weighted-Average Grant-Date Fair Value
Expiration term	1 year
Restricted Stock Awards \| Maximum
Weighted-Average Grant-Date Fair Value
Expiration term	5 years
Restricted Stock Units \| Minimum
Weighted-Average Grant-Date Fair Value
Vesting period	1 year
Restricted Stock Units \| Maximum
Weighted-Average Grant-Date Fair Value
Vesting period	5 years

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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-Publisher FASB

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends.

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

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