INCOME TAXES (Components of Income (Loss) before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2019	[1]	Sep. 30, 2019	[2]	Jun. 30, 2019	[3]	Mar. 31, 2019	[4]	Dec. 31, 2018	[1]	Sep. 30, 2018	[2]	Jun. 30, 2018	[3]	Mar. 31, 2018	[4]	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Components of income (loss) before income taxes
U.S.																	$ 237,296	$ 255,088	$ 213,171
Non-U.S.																	131,197	113,572	153,065
Income before income taxes	$ 80,294		$ 91,797		$ 103,484		$ 92,918		$ 94,455		$ 95,744		$ 94,263		$ 84,198		$ 368,493	$ 368,660	$ 366,236

[1] 2019 includes special item charges of $8,851 ($7,284 after-tax) for Rationalization and asset impairment charges. 2018 includes special item charges of $1,696 ($1,272 after-tax) for pension settlement charges, $932 ($841 gain after-tax) for Rationalization and asset impairment charges and gains or losses on the disposal of assets, a $4,424 credit related to the U.S. Tax Act and acquisition-related items including $833 ($690 after-tax) for acquisition transaction and integration costs.

[2] 2019 includes special item charges of $1,495 ($1,240 after-tax) for Rationalization and asset impairment charges, $1,609 for amortization of step up in value of acquired inventories and $7,601 for a gain on change in control related to the acquisition of Askaynak. 2018 includes special item charges of $4,232 ($3,176 after-tax) for pension settlement charges, $2,636 ($2,575 after-tax) for Rationalization and asset impairment charges, an adjustment to taxes on unremitted foreign earnings related to the U.S. Tax Act of $2,323 and acquisition-related items including $970 ($797 after-tax) for acquisition transaction and integration costs.

[3] 2019 includes special item charges of $3,554 ($2,586 after-tax) for gains on the disposal of assets, $1,399 ($1,049 after-tax) for amortization of step up in value of acquired inventories, $1,014 ($867 after-tax) for acquisition transaction and integration costs, $1,307 ($937 after-tax) for Rationalization and asset impairment charges and $4,852 for the settlement of a tax item as well as tax deductions associated with an investment in a subsidiary. 2018 includes special item charges of $11,542 ($10,362 after-tax) for Rationalization and asset impairment charges and $788 ($675 after-tax) for acquisition transaction and integration costs.

[4] 2019 includes special item charges of $3,535 ($2,814 after-tax) for Rationalization and asset impairment charges and $790 ($698 after-tax) for acquisition transaction and integration costs. 2018 includes special item charges of $758 ($569 after-tax) for pension settlement charges, $10,175 ($7,870 after-tax) for Rationalization and asset impairment charges, an adjustment to taxes on unremitted foreign earnings related to the U.S. Tax Act of $2,500 and $1,907 ($1,520 after-tax) for acquisition transaction and integration costs.