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Income Tax Expense (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 12 Months Ended
Dec. 31, 2009
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Maximum [Member]
Dec. 31, 2011
Minimum [Member]
Uncertain tax positions, net accrued interest $ 50 $ 45 $ 50    
Uncertain tax positions decrease in accrued interest (250)        
Unrecognized tax benefits that would impact effective tax rate   $ 600      
Foreign and United States jurisdictions, period of statutes of limitations, years       5 3