Share-based Compensation Arrangement by Share-based Payment Award Cumulative Shares Issued.

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

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The weighted average period over which unrecognized compensation is expected to be recognized for equity-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. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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

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The 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 during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

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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.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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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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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 difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

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 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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The combined weighted average exercise price associated with stock options during the period that have either lapsed or been forfeited.

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Net number of share options (or share units) granted during the 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 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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- 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.

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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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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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Number of share options (or share units) exercised during the current period.

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Employee Benefit and Other Plans (Details) (USD $)	3 Months Ended		6 Months Ended
Employee Benefit and Other Plans (Details) (USD $)	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based awards issued	6,000,000		6,000,000
Share-based awards available for grant	1,700,000		1,700,000
Share-based compensation expense	$ 2,300,000	$ 2,100,000	$ 3,800,000	$ 3,500,000
Unamortized compensation costs	19,700,000		19,700,000
Unamortized compensation costs period of recognition			3
Proceeds from common stock options exercised	$ 400,000	$ 6,500,000		$ 6,519,000
Options Outstanding [Roll Forward]
Options outstanding at January 1, 2011			5,604,916
Options outstanding, weighted average exercise price, beginning balance			$ 13.69
Options granted, shares			1,039,000
Options granted, weighted average exercise price	$ 13.92		$ 13.92
Options exercised, shares			(369,569)
Options exercised, weighted average exercise price	$ 7.81		$ 7.81
Options cancelled or forfeited, shares			(565,275)
Options cancelled or forfeited, weighted average exercise price			$ 17.43
Options outstanding at June 30, 2011	5,709,072		5,709,072
Options outstanding, weighted average exercise price, ending balance	$ 14.03		$ 14.03
Options Vested and Expected to Vest [Abstract]
Vested or expected to vest at a point in the future as of June 30, 2011	5,256,382		5,256,382
Options - Additional Disclosures [Abstract]
Options exercisable at June 30, 2011, shares	2,769,172		2,769,172
Options exercisable at June 30, 2011, weighted average exercise price	$ 16.11		$ 16.11
Weighted-average value per granted option calculated using the Black-Scholes option-pricing model for options granted during the six months ended June 30, 2011			$ 6.98
Unvested Shares [Roll Forward]
Unvested shares at January 1, 2011 (shares)			320,325
Unvested shares at January 1, 2011 (Weighted-avereage grant date fair value)			$ 10.40
Unvested shares granted (shares)			118,626
Unvested shares ganted (Weighted-avereage grant date fair value)			$ 13.72
Unvested shares vested (shares)			(122,000)
Unvested shares granted (Weighted-avereage grant date fair value)			$ 12.25
Unvested shares cancelled/forfeited (shares)			(65,100)
Unvested shares cancelled/forfeited (Weighted-avereage grant date fair value)	$ 8.09		$ 8.09
Unvested shares at June 30, 2011 (shares)	251,851		251,851
Unvested shares at June 30, 2011 (Weighted-avereage grant date fair value) CLONE	$ 11.66		$ 11.66
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based awards issued	251,851		251,851