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Share Repurchase Program (Details) (USD $)	0 Months Ended	1 Months Ended			9 Months Ended
Share Repurchase Program (Details) (USD $)	Jul. 26, 2012	May 31, 2011	Sep. 30, 2010	Feb. 28, 2010	Sep. 30, 2012
Share Repurchase Program (Textual) [Abstract]
Share repurchase program	$ 90,000,000		$ 30,000,000	$ 15,000,000
Stock Repurchase Program, Additional Authorized Amount	30,000,000	30,000,000
Share Repurchase Program (Additional Textual) [Abstract]
Common stock for an aggregate price					28,400,000
Total repurchase shares					2,820,141
Maximum [Member]
Share Repurchase Program (Textual) [Abstract]
Share repurchase program					$ 25,300,000

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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