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OTHER INCOME (EXPENSE) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Other Income and Expenses [Abstract]        
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Gain (Loss) Due to Settlement and Curtailment   $ (4,232)   $ (4,990)
Equity earnings in affiliates $ 206 542 $ 3,002 3,301
Other income (2) [1] 8,819 1,334 12,441 3,647
Other components of net periodic pension (cost) income (1) [2] 628 (2,950) 2,169 (130)
Total Other income (expense) 9,653 $ (1,074) 17,612 6,818
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net $ 7,601   $ 7,601 $ 0
[1]
Includes a gain on change in control related to the acquisition of Askaynak in the three and nine months ended September 30, 2019 of $7,601. Refer to Note 4 to the consolidated financial statements for details.
[2] Includes pension settlement charges in the three and nine months ended September 30, 2018 of $4,232 and $4,990. Refer to Note 13 to the consolidated financial statements for details.