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Other Non-Operating Income (Details 1) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Other Nonoperating Income (Expense) [Abstract]        
Gain on sale of equity affiliate $ 0 $ 0 $ 28,994 $ 0
Foreign currency gain (loss), net 109 (2,266) 623 (2,089)
Gain on sales of businesses 232 1,334 421 7,241
Gain on sale of a cost method investment 0 0 0 2,845
Gain (loss) on sale of property, plant and equipment 0 2,542 (44) 2,542
Other, net 887 723 585 981
Total Other Non-Operating Income $ 1,228 $ 2,333 $ 30,579 $ 11,520