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Business and Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2013
Accounting Policies [Abstract]  
Marketable Securities and Other Comprehensive Income
(in thousands)     March  31,     2013     December 31,     2012
  Marketable equity securities at fair value $5,683  $7,093 
  Cost   851     851 
  Accumulated other comprehensive income for
    unrealized holding gains		 4,832  6,242  
  Deferred taxes on accumulated other comprehensive
    income for unrealized holding gains		  1,802  2,328 
Accumulated other comprehensive income $3,030  $3,914 
Changes in Marketable Securities
(in thousands) Three months ended
March 31,
  2013 2012
Gross cash proceeds $   -    $    353 
Cost  -      21 
Gross gain on sale included in earnings during the period  - 332 
Deferred taxes on gross gain on sale included in earnings  - (124)
Reclassification adjustment to unrealized gain in other
   comprehensive income for net gains included in earnings		 -    (208)
Gross unrealized holding loss arising during the period
   included in other comprehensive loss		 (1,410) (1,086)
Deferred taxes on unrealized holding loss included in
   other comprehensive loss		  526  405 
Net unrealized holding (loss) gain (884) (681)
Other comprehensive (loss) income from marketable equity securities $(884) $(889)