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Consolidated Statements of Cash Flows (Parenthetical) (USD $)
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2011
Sep. 30, 2010
Supplemental Schedule of Noncash Investing and Financing Activities:   
Cash dividends declared (in dollars per share)$ 0.0375  
Cash dividends declared, but not yet paid$ 2,700,000$ 2,700,000$ 2,200,000
Capital expenditure accrual 900,000 
Equity issued for acquisition27,500,00027,500,000 
Promissory notes issued for acquisition8,300,0008,300,000 
Issuance of equity awards to employees in grant of service 1,500,000 
Assets acquired, net of cash 203,979,00083,766,000
Liabilities assumed $ 49,603,000$ 23,217,000