The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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

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The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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As of the balance-sheet date, the aggregate unrecognized cost of share-based awards made to employees under share-based compensation plans that have yet to vest.

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The weighted average period over which unrecognized compensation is expected to be recognized for share-based compensation plans, using a decimal to express in number of years.

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The cash inflow associated with the amount received from holders exercising their stock options.

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The noncash expense that represents the cost of restricted stock distributed to employees as compensation.

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The total fair value of share-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

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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.

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The weighted average period between the balance-sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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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.

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

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

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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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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 .

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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.

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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.

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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.

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

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- Definition

The noncash expense that accounts for the value of stock options distributed to employees as compensation.

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-Name Statement of Financial Accounting Standard (FAS)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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-Subparagraph i

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Share-Based Compensation (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011 number	Jun. 30, 2010	Jun. 30, 2011 number	Jun. 30, 2010
Share based compensation expense [Line Items]
Total share-based compensation expense	$ 3,283,000	$ 3,233,000	$ 6,467,000	$ 6,514,000
Cash proceeds received from stock option excercises			3,000,000
Stock Option Expense	1,000,000	1,000,000	2,000,000	2,000,000
Unrecognized compensation expense [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value			5,000,000
Restricted Stock Expense	2,000,000	2,000,000	4,000,000	4,000,000
Share Based Compensation Arrangment [Roll Forward]
Outstanding Beginning Shares			3,707
Granted Shares			363
Exercised Shares			(476)
Forfeited or Expired Shares			0
Outstanding Ending Shares	3,594		3,594
Shares Exercisable	2,623		2,623
Outstanding Beginning Weighted Average Exercise Price			$ 14.14
Granted Weighted Average Exercise Price	$ 29.21		$ 29.21
Exercisable Weighted Average Exercise Price	$ 6.97		$ 6.97
Forfeited or Expired Weighted Average Exercise Price			$ 0
Outstanding Ending Weighted Average Exercise Price	$ 16.61		$ 16.61
Exercisable Weighted Average Exercise Price	$ 14.48		$ 14.48
Outstanding Beginning Weighted Average Exercise Term			5
Outstanding Ending Weighted Average Exercise Term	6		6
Exercisable Weighted Average Exercise Term			4
Outstanding Beginning Intrinsic Value			47,891,000
Exercised Intrinsic Value			10,957,000
Outstanding Ending Intrinsic Value	35,726,000		35,726,000
Exercisable Intrinsic Value	30,860,000		30,860,000
Cost of Sales [Member]
Share based compensation expense [Line Items]
Total share-based compensation expense	89,000	82,000	175,000	175,000
Selling and adminstrative expense [Member]
Share based compensation expense [Line Items]
Total share-based compensation expense	2,961,000	2,822,000	5,829,000	5,686,000
Research and development expense [Member]
Share based compensation expense [Line Items]
Total share-based compensation expense	233,000	329,000	463,000	653,000
Stock Options [Member]
Unrecognized compensation expense [Line Items]
Unrecognized share-based compensation expense	12,000,000		12,000,000
Unrecognized share-based compensaion expense - years			3
Restricted Stock [Member]
Unrecognized compensation expense [Line Items]
Unrecognized share-based compensation expense	$ 20,000,000		$ 20,000,000
Unrecognized share-based compensaion expense - years			3