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Other Comprehensive Income
 6 Months Ended
Jun. 30, 2011
Stockholders' Equity and Other Comprehensive Income [Abstract]  
Other Comprehensive Income
11. Other Comprehensive Income
The components of other comprehensive income on a pre-tax and after-tax basis are as follows (in thousands):
                                                 
    Three Months             Six Months          
    Ended June 30, 2010     Ended June 30, 2010  
    Pretax     Tax     After-tax     Pretax     Tax     After-tax  
Unrealized gains, on investments, net, arising during the periods
  $ 5,869     $ (2,264 )   $ 3,605     $ 4,979     $ (1,921 )   $ 3,058  
Less: reclassification adjustments of realized gains on investments
    4,457       (1,719 )     2,738       8,152       (3,145 )     5,007  
Plus: Other-than-temporary impairment of investments
    —       —       —       (2,408 )     929       (1,479 )
Less: reclassification adjustments of foreign currency gains on investments
    125       (49 )     76       809       (312 )     497  
 
                                   
Other comprehensive income (loss)
  $ 1,287     $ (496 )   $ 791     $ (1,574 )   $ 607     $ (967 )
 
                                   
There were no amounts of other comprehensive income for the three and six month periods ended June 30, 2011.