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Supplemental Balance Sheet, Income Statement and Cash Flow Information (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Investment income (loss)    
Interest and dividend income $ 970 $ 776
Gains (losses) on investments, net 10 78,645
Investment income (loss) $ 980 $ 79,421