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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2012
Income Tax Disclosure [Abstract]  
Changes in Income Taxes
(thousands)  Three months ended
September 30
  Nine months ended
September 30
   2012  2011  2012  2011
Income tax benefit  $436   $569   $432   $476 
Deferred tax benefit (expense) on unrealized
losses on marketable equity securities in other
comprehensive income
  $(576)  $516   $964   $2,397