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9. Other Income and Expenses (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Interest and investment income $ (900,000)us-gaap_InvestmentIncomeInterestAndDividend $ (700,000)us-gaap_InvestmentIncomeInterestAndDividend
Net realized gain on investments (300,000)us-gaap_RealizedInvestmentGainsLosses 0us-gaap_RealizedInvestmentGainsLosses
Other (income) expense, net $ 1,153,000us-gaap_OtherNonoperatingIncomeExpense $ 661,000us-gaap_OtherNonoperatingIncomeExpense