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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY AND COMPREHENSIVE INCOME [Paranthetical] (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Common Stock, Dividends, Per Share, Cash Paid $ 0.61 $ 0.53 $ 0.48
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures, Total 28,611 16,664 42,500
Stock Issued During Period, Shares, Purchase of Assets   13,200