Quarterly report pursuant to Section 13 or 15(d)

Share Repurchases (Details)

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Share Repurchases (Details) (USD $)
1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2011
Aug. 31, 2010
Jul. 08, 2012
Jul. 10, 2011
Jul. 08, 2012
Jul. 10, 2011
Share Repurchases            
Amount authorized for repurchase of equity securities $ 50,000,000 $ 50,000,000        
Shares repurchased     255,131 25,000 255,131 422,530
Average purchase price (in dollars per share)     $ 30.22 $ 33.57 $ 30.22 $ 24.56
Aggregate price of shares repurchased     7,700,000 840,000 7,700,000 10,400,000
Amount under the plan that may be purchased under board authorized repurchase plan         $ 40,000,000