Shareholders' Equity (Summary of Stock Option Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2011
Shareholders' Equity
Options Outstanding - Beginning balance	2,067
Options Outstanding, Granted	237
Options Outstanding, Exercised	(40)
Options Outstanding, Forfeited/expired	(87)
Options Outstanding - Ending balance	2,177
Weighted-Avg Exercise Price - Beginning balance	$ 14.82
Weighted-Avg Exercise Price, Granted	$ 11.01
Weighted-Avg Exercise Price, Exercised	$ 7.67
Weighted-Avg Exercise Price, Forfeited/expired	$ 15.62
Weighted-Avg Exercise Price - Ending balance	$ 14.50
Weighted-Avg Remaining Contractual Term (Years)	6.00
Aggregate Intrinsic Value	$ 1,692
Options exercisable, end of period - Options Outstanding	1,284
Options exercisable, end of period - Weighted-Avg Exercise Price	$ 16.36
Options exercisable, end of period - Weighted-Avg Remaining Contractual Term (Years)	4.22
Options exercisable, end of period - Aggregate Intrinsic Value	$ 1,288

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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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 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.

+ References

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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.

+ References

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

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