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Shareholders' Equity (Details) (USD $)
In Thousands, unless otherwise specified
0 Months Ended 3 Months Ended 9 Months Ended
May 25, 2011
Feb. 22, 2011
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Shareholders' Equity [Abstract]          
Shareholder's plan, expiration date       Jan. 31, 2012  
Authorized repurchase of common stock, amount $ 20,000 $ 15,000      
Repurchase of common stock, shares     609 104 2,660
Repurchase of common stock, net     $ 1,872 $ 213 $ 14,921