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Consolidated Statements of Cash Flows (Parenthetical) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Supplemental Schedule of Noncash Investing and Financing Activities:    
Cash dividends declared (in dollars per share) $ 0.0375 $ 0.0375
Cash dividends declared, but not yet paid $ 2,700,000 $ 2,600,000
Capital expenditure accrual 900,000  
Increase in goodwill purchase price adjustment 700,000  
Issuance of equity awards to employees in grant 2,700,000 1,500,000
Equity issued for acquisition   27,500,000
Assets acquired, net of cash   127,360,000
Liabilities assumed   $ 32,979,000