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Share Repurchase Program (Details) (USD $)	12 Months Ended
Share Repurchase Program (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2009	Dec. 31, 2008	Sep. 24, 2007
Share Repurchase Program (Textual) [Abstract]
Stock Repurchase Program Authorized Aggregate Amount				$ 100,000
Stock repurchase program total cost	$ 7,071
Stock repurchase program average price	$ 23.57
Share repurchased under share repurchase program	0	100,000	200,000
Cumulative number of shares repurchased	300,000

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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- Definition

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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