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Consolidated Statements of Cash Flows (Parenthetical) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 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 $ 2,700,000 $ 2,700,000 $ 2,700,000
Promissory notes issued for acquisition 2,200,000 7,500,000 2,200,000 7,500,000
Common stock issued for acquisition   27,500,000   27,500,000
Issuance of equity awards to employees in grant     2,700,000 1,500,000
Assets acquired, net of cash     28,795,000 188,959,000
Liabilities assumed     $ 3,157,000 $ 47,967,000