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OTHER INCOME (EXPENSE) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
OTHER INCOME (EXPENSE)
Income (Loss) from Equity Method Investments		$ 408	$ 3,163	$ 5,481
Defined Benefit Plan, Other (Cost) Credit	[1]	(1,575)	2,787	502
Other Nonoperating Income (Expense)		5,109	15,048	4,703
Total other income (expense)		$ 3,942	$ 20,998	$ 10,686
[1] Other components of net periodic pension (cost) income includes pension settlements and curtailments. Refer to Note 12 to the consolidated financial statements for details.

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