Share Based Compensation (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
Sep. 30, 2011 Y D business segment market
Stock option activity and related information
Outstanding Beginning balance, options	21,862
Outstanding Beginning balance, Weighted average exercise price	$ 15.96
Granted, options	10,625
Granted, Weighted average exercise price	$ 6.03
Exercised, options	99
Exercised, Weighted Average Exercise price	$ 4.06
Forfeited or expired , options	4,756
Forfeited or expired, Weighted average exercise price	$ 19.02
Outstanding Ending balance, options	27,632
Outstanding Ending balance, Weighted average exercise price	$ 11.65
Outstanding Ending balance, Weighted average remaining contractual life (years)	4.3
Outstanding Ending balance, Aggregate intrinsic value	$ 1,614
Vested and expected to vest, options	26,327
Vested and expected to vest, Weighted average exercise price	$ 11.94
Vested and expected to vest, Weighted average remaining contractual life (years)	4.2
Vested and expected to vest, Aggregate intrinsic value	1,583
Exercisable, options	14,160
Exercisable, Weighted average exercise price	$ 17.15
Share Based Compensation Arrangement By Share Based Payment Award Option Exercisable Weighted Average Remaining Contractual Term	2.3
Share Based Compensation Arrangement By Share Based Payment Award Option Exercisable Intrinsic Value	$ 959

Share based compensation arrangement by share based payment award option exercisable intrinsic value.

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Share based compensation arrangement by share based payment award option exercisable weighted average remaining contractual term.

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Share Based Compensation Arrangement By Share Based Payment Award Option Exercises In Period Weighted Average Exercise Price.

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Share Based Compensation Arrangement By Share Based Payment Award Option Grants In Period Weighted Average Exercise Price.

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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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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 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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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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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 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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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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As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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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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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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The weighted-average period between the balance sheet date and expiration date for fully vested and expected to vest options outstanding, which may be expressed in a decimal value for number of years.

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

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