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Income Taxes (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operating Loss Carryforwards [Line Items]      
Income taxes paid $ 75,403,000 $ 69,828,000 $ 76,373,000
Range of expiration dates for portions of net operating loss carryforwards 2012 through 2031    
Accrued interest related to uncertain tax positions 188,000 140,000  
Total amount of unrecognized tax benefits that would affect effective tax rate 806,000 656,000  
Federal Income Tax [Member]
      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 295,000    
Fiscal years open for audit 2008 through 2011    
State Income Tax [Member]
      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards $ 40,915,000    
Fiscal years open for audit 2007 through 2011    
United Kingdom [Member]
      
Operating Loss Carryforwards [Line Items]      
Fiscal years open for audit 2008 through 2011