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10. Other Income and Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Interest and investment income $ (19,100) $ (14,700) $ (10,100)
Net realized (gains) losses on investments (100) (800) (1,600)
Other-than-temporary impairment losses on investments 7,000 600 600
Other (income) expense, net $ (12,197) $ (14,850) $ (11,080)