Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Details)

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Shareholders' Equity (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2011
Stockholders' Equity Note [Abstract]    
Number of shares authorized to be repurchased (in shares) 2,000,000  
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares) 815,059  
Common Stock [Member]
   
Shareholders' Equity [Line Items]    
Quarterly Cash Dividend per Share, Common Stock $ 0.07 $ 0.07