INCOME TAX EXPENSE (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended					6 Months Ended	9 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016	Mar. 31, 2018	Jun. 30, 2018	Jun. 30, 2017
Income Tax Expense [Line Items]
Effective Income Tax Rate Reconciliation, Percent	18.40%			27.40%			(28.10%)	31.40%
Income Tax Expense (Benefit)	$ 4,297			$ 4,777			$ (13,983)	$ 15,837
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			24.50%		35.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	400	$ 1,000	$ 30,300
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent			1.50%				61.70%
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Amount	$ 500	$ 700	$ 2,900				$ 4,100
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount			$ 2,300
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent	2.10%	4.70%					8.20%
Effective Income Tax Rate Reconciliation, Deduction, Amount	$ 300					$ 300
Effective Income Tax Rate Reconciliation, Deduction, Percent	2.90%					1.60%	1.40%
Additional Pension Contribution to be Made	$ 7,500						$ 7,500
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	1.40%						0.70%
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Percent	1.90%			5.20%			0.90%	1.80%
Tax Cuts and Jobs Act [Member]
Income Tax Expense [Line Items]
Income Tax Expense (Benefit)	$ 100						$ 24,300