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Accumulated Other Comprehensive Income
6 Months Ended
Jun. 30, 2012
Accumulated Other Comprehensive Income [Abstract]  
Accumulated Other Comprehensive Income
8.
Accumulated Other Comprehensive Income

Activity in accumulated other comprehensive income is reflected in the consolidated statements of comprehensive income (loss) and consolidated statements of changes in equity but not in the consolidated statements of operations.  A summary of accumulated other comprehensive income, net of taxes at June 30, 2012 and December 31, 2011 is as follows (in thousands):

   
June 30,
   
December 31,
 
   
2012
   
2011
 
             
Net unrealized gains on investments
  $ 630,552     $ 998,151  
Net unrealized foreign exchange losses
    (7,674 )     (3,168 )
Net unrealized losses on derivative instruments
    (153 )      
Net minimum pension liability
    (81,656 )     (83,537 )
Net postretirement benefit
    652       975  
    $ 541,721     $ 912,421