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Shareholders' Equity (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Stockholders' Equity Note [Abstract]    
Remaining value of stock repurchase programs authorization $ 102,300,000  
Stock repurchased under authorized repurchase program 0  
Payments for Repurchase of Common Stock $ (845,000) $ (969,000)