Stock Plans (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Options Exercisable
Shares	1,409,000
Weighted-Average Exercise Price (in dollars per share)	$ 30.76
Recognized share-based compensation
Share-based compensation expense before tax	$ 18,813	$ 13,132	$ 13,853
Income tax benefit	(6,011)	(4,367)	(4,849)
Net share-based compensation expense	12,802	8,765	9,004
Cost of Sales
Recognized share-based compensation
Share-based compensation expense before tax	2,456	1,446	1,467
Selling, General and Administrative Expenses
Recognized share-based compensation
Share-based compensation expense before tax	11,859	8,339	9,677
Research and Development Expense
Recognized share-based compensation
Share-based compensation expense before tax	$ 4,498	$ 3,347	$ 2,709
Stock Options
Stock option awards, Shares
Outstanding at the beginning of the period (in shares)	2,598,000	2,322,000	2,106,000
Granted (in shares)	509,000	539,000	704,000
Exercised (in shares)	(561,000)	(149,000)	(351,000)
Expired or forfeited (in shares)	(155,000)	(114,000)	(137,000)
Outstanding at the end of the period (in shares)	2,391,000	2,598,000	2,322,000
Weighted Average Exercise price
Outstanding at the beginning of the period (in dollars per share)	$ 29.98	$ 28.63	$ 25.58
Granted (in dollars per share)	$ 33.05	$ 32.68	$ 32.55
Exercised (in dollars per share)	$ 23.88	$ 14.74	$ 15.39
Expired or terminated (in dollars per share)	$ 36.22	$ 35.22	$ 35.88
Outstanding at the end of the period (in dollars per share)	$ 31.65	$ 29.98	$ 28.63

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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.

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Weighted average price of options that were either forfeited or expired.

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

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

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

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