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Supplemental Balance Sheet, Income Statement and Cash Flow Information (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Investment income (loss)        
Interest and dividend income $ 2,028 $ 2,342 $ 2,998 $ 3,118
Gains (losses) on investments, net 5,038 12,479 5,048 91,124
Investment income (loss) $ 7,066 $ 14,821 $ 8,046 $ 94,242