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Income Taxes
 3 Months Ended
Mar. 31, 2012
Income Taxes [Abstract]  
Income Taxes
9. Income Taxes

At March 31, 2012, we had $2.2 million of net unrecognized tax benefits, $1.4 million of which would affect our effective tax rate if recognized. We recognize interest and penalties related to uncertain tax positions in income tax expense. As of March 31, 2012, we had approximately $0.3 million of accrued interest related to uncertain tax positions.

The last United States federal return examined by the Internal Revenue Service was 2005, and all years up through and including that year are closed by examination. We are currently under examination for tax years 2006-2007 by one state tax authority to which we are subject to tax. In addition, we are also under examination for the tax years 2007-2009 by another state tax authority to which we are subject to tax. The tax years 2007-2011 remain open to examination by the remaining major taxing jurisdictions in the United States to which we are subject. The tax years 2007-2011 remain open to examination in Sweden for our Swedish subsidiary.