XML 51 R40.htm IDEA: XBRL DOCUMENT v2.4.0.8
Investments (Details 7) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Gross unrealized losses with number of securities [Line Items]    
Gross Unrealized Losses $ 310,734 $ 133,558
% of Total 100.00% 100.00%
Less than 20%
    
Gross unrealized losses with number of securities [Line Items]    
Gross Unrealized Losses 267,765 54,951
% of Total 86.20% 41.20%
20% or more for less than six months
    
Gross unrealized losses with number of securities [Line Items]    
Gross Unrealized Losses 5,629 734
% of Total 1.80% 0.50%
20% or more for six months or greater
    
Gross unrealized losses with number of securities [Line Items]    
Gross Unrealized Losses $ 37,340 $ 77,873
% of Total 12.00% 58.30%