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Income Taxes
9 Months Ended
Sep. 30, 2011
Income Taxes [Abstract] 
Income Taxes
6.
Income taxes
 
As of September 30, 2011 and December 31, 2010, we had total unrecognized tax benefits (excluding interest) of $16,600.  The total amount of unrecognized tax benefits (including interest and net of federal benefit) that, if recognized, would affect the effective tax rate as of September 30, 2011 and December 31, 2010, respectively, are approximately $2,000.
 
We recognize interest and penalties accrued related to unrecognized tax benefits in income tax expense.  As of September 30, 2011 and December 31, 2010, we had approximately $400 and $300, respectively, of accrued interest related to unrecognized income tax benefits.
 
We do not expect a significant change in the balance of unrecognized tax benefits within the next twelve months.
 
Our federal income tax returns beginning in 2008 are subject to examination.  Material state and local income tax matters have been concluded for years through 2002.  The majority of our state returns beginning in 2005 are subject to examination.  Our Icelandic tax returns are subject to examination and income tax matters have been concluded for years through 2001.