Shareholders' Equity (Narrative) (Details) (USD $) In Thousands	6 Months Ended	36 Months Ended
Jun. 30, 2011	Jun. 30, 2011
Shareholders' Equity
Common shares repurchased, shares	90	2,908
Common shares repurchased, value	$ 22,484	$ 252,685
Value of common shares remaining to be repurchased	$ 47,575

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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