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Income Taxes (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Taxes (Textual) [Abstract]      
U.S. capital loss carryfowards, expiration period 2013    
Foreign net operating loss carryforwards expiration period start year 2013    
Foreign net operating loss carryforwards expiration period end year 2017    
Valuation allowance $ (2,329,000) $ (3,115,000)  
U.S. capital loss carryfowards, valuation allowance, amount 2,000,000    
Net decrease in valuation allowance from the prior year 800,000    
Deferred tax liability not established by the company 117,000,000    
Income taxes paid, net of refunds 16,000,000 14,000,000 8,400,000
Recognized accrued interest and penalties lapsed 100,000 100,000 100,000
Payment of interest accrued 600,000 500,000 400,000
Accrued penalties payment 300,000 300,000 300,000
Unrecognized tax benefits that would impact effective tax rate 700,000 500,000 400,000
Decrease in unrecognized tax benefits 200,000    
Foreign Country [Member]
      
Tax Credit Carryforward [Line Items]      
Foreign net operating loss carryfowards 800,000    
Foreign net operating loss carryfowards, valuation allowance, amount 300,000    
Internal Revenue Service (IRS) [Member]
      
Tax Credit Carryforward [Line Items]      
U.S. capital loss carryfowards $ 2,000,000