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EQUITY ROLL FORWARD (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
EQUITY ROLL FORWARD (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance			$ 702,621
Net income	$ 29,932	$ 24,548	81,186	$ 70,726
Dividends on common stock			(16,299)
Common stock issued			8,747
Common stock repurchased			(12,080)
Share-based compensation			6,627
Currency translation adjustment			(36,611)
Pension liability, net of tax			1,797
Equity, ending balance	736,345		736,345
Increase (Decrease) in Temporary Equity
Temporary equity, beginning balance			1,502
Net income			(1,018)
Currency translation adjustment			132
Temporary equity, ending balance	616		616
Common Stock
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance			4,663
Common stock issued			38
Common stock repurchased			(29)
Share-based compensation			10
Equity, ending balance	4,682		4,682
Additional Paid in Capital
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance			240,136
Common stock issued			8,709
Share-based compensation			6,617
Equity, ending balance	255,462		255,462
Retained Earnings
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance			604,905
Net income			81,677
Dividends on common stock			(16,299)
Common stock repurchased			(12,051)
Equity, ending balance	658,232		658,232
Minimum Pension Liability
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance			(49,364)
Pension liability, net of tax			1,797
Equity, ending balance	(47,567)		(47,567)
Cumulative Translation Adjustment
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance			(99,683)
Currency translation adjustment			(36,576)
Equity, ending balance	(136,259)		(136,259)
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity
Equity, beginning balance			1,964
Net income			527
Currency translation adjustment			(35)
Equity, ending balance	$ 1,795		1,795
Increase (Decrease) in Temporary Equity
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders			661
Total Equity
Increase (Decrease) in Stockholders' Equity
Net income			82,204
Increase (Decrease) in Temporary Equity
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders			$ 661