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8. Other Income and Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Interest and investment income $ (2,100) $ (1,100)
Net realized loss (gain) on investments 100 (300)
Gain on sale of land (4,100) 0
Gain on divestiture of a product line (5,100) 0
Other Nonoperating Expense 100 400
Nonoperating Income (Expense) $ 11,145 $ 1,043