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Other Non-Operating Income (Details 1) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Other Nonoperating Income (Expense) [Abstract]        
Gain (loss) on sales of businesses $ 1,334 $ 0 $ 7,241 $ (342)
Gain on sale of a cost method investment 0 0 2,845 0
Gain on sale of land 2,542 0 2,542 0
Foreign currency (loss) gain, net (2,266) 3,466 (2,089) 5,194
Other, net 723 603 981 66
Total Other Non-Operating Income $ 2,333 $ 4,069 $ 11,520 $ 4,918