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9. Other Income and Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Interest and investment income $ (12,000) $ (10,600) $ (13,100) $ (11,900)
Net realized loss (gain) on investments 200 (600) (100) (500)
Other (income) expense, net $ (11,757) $ (11,208) $ (13,175) $ (12,385)