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10. Other Income and Expenses (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Interest and investment income $ (1,100,000) $ (1,000,000) $ (10,200,000) $ (7,900,000)
Net realized losses (gains) on investments 500,000 (1,100,000) 200,000 (8,500,000)
Miscellaneous other (income) expense items, net (100,000) 600,000 (700,000) 1,700,000
Other (income) expense, net $ 667,000 $ 1,511,000 $ 10,711,000 $ 14,692,000