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Shareholders' Equity (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
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 $ 6,427,000 $ 845,000