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Consolidated Statements of Cash Flows (Parenthetical) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Supplemental Schedule of Noncash Investing and Financing Activities        
Cash dividends declared (in dollars per share) $ 0.0375 $ 0.0375    
Cash dividends declared $ 2,700,000 $ 2,700,000 $ 2,700,000 $ 2,700,000
Capital expenditure accrual     7,300,000  
Portion of equity awards granted that was previously recorded in accrued expenses and other current liabilities       2,700,000
Assets acquired, net of cash     29,947,000 28,795,000
Liabilities assumed     20,471,000 3,157,000
Purchase price adjustment     1,600,000  
Promissory notes issued for acquisition   $ 2,200,000   $ 2,200,000