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Consolidated Statements of Cash Flows (Parenthetical) (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Supplemental Schedule of Noncash Investing and Financing Activities    
Cash dividends declared, but not yet paid $ 2,700,000 $ 2,700,000
Capital expenditure accrual 2,800,000  
Portion of equity awards granted that was previously recorded in accrued expenses and other current liabilities   2,700,000
Assets acquired, net of cash 54,998,000 140,725,000
Liabilities assumed 30,286,000 69,859,000
Promissory notes issued for acquisition 3,000,000 7,200,000
Purchase price adjustments $ 2,000,000