Share Repurchase Program (Details) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011
Share Repurchase Program [Abstract]
Authorized share repurchased program amount		$ 100,000,000
Repurchased shares (in shares)	1,217,100	1,217,100
Cost of repurchased shares		(17,613,000)
Amount available under the share repurchase program		$ 82,400,000