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Income taxes
 6 Months Ended
Jun. 30, 2012
Income Tax Disclosure [Abstract]  
Income taxes
Income taxes
The components of our unrecognized tax positions are as follows:
 
June 30, 2012
December 31, 2011
Highly certain tax positions
$
15,700

$
15,100

Other unrecognized tax benefits
900

800

Gross unrecognized tax benefits
$
16,600

$
15,900

Accrued interest and penalties related to unrecognized tax benefits
$
150

$
100

We recognize interest and penalties accrued related to unrecognized tax benefits in income tax expense.
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. Our 2008 tax year is currently under audit by the Internal Revenue Service (“IRS”). Additionally, a 2005 amended return is also under audit with respect to carry back items. Our state returns beginning in 2005 are subject to examination. Our Icelandic tax returns are subject to examination beginning with the 2005 tax year.
For the years 2011, 2010 and 2009, we did not elect to permanently reinvest foreign earnings . In March 2012, we removed our election to permanently reinvest foreign earnings prior to 2009.