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9. Other Income and Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Interest and investment income $ (1,200) $ (1,300) $ (14,300) $ (13,200)
Net realized loss (gain) on investments (200) (100) (300) (600)
Other (income) expense, net $ (1,436) $ (1,439) $ (14,611) $ (13,824)