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9. Other Income and Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Interest and investment income $ (19,500) $ (2,100)
Net realized loss on investments 0 100
Other than Temporary Impairment Losses on Investment 1,600 0
Gain on sale of land 0 (4,100)
Gain on divestiture of a product line 0 (5,100)
Other Nonoperating Income (800)  
Other Nonoperating Expense   100
Nonoperating (Income( Expense $ (18,696) $ (11,145)