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INCOME TAX EXPENSE (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2018
Mar. 31, 2017
Income Tax Expense [Line Items]            
Effective Income Tax Rate Reconciliation, Percent 26.40%   33.70%   69.30% 33.60%
Income Tax Expense (Benefit) $ 3,590   $ 5,662   $ (18,280) $ 11,060
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 1,000 $ 30,300        
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent   114.90%        
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Amount 700 $ 2,900     $ 3,600  
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount $ 700 $ 2,300        
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent 4.90% 8.90%     13.60%  
Effective Income Tax Rate Reconciliation, Deduction, Amount $ 300          
Effective Income Tax Rate Reconciliation, Deduction, Percent 5.80%       3.00%  
Effective Income Tax Rate Reconciliation, Disposition of Business, Percent 1.50%       0.80%  
Additional Pension Contribution to be Made $ 7,500       $ 7,500  
Tax Cuts and Jobs Act [Member]            
Income Tax Expense [Line Items]            
Income Tax Expense (Benefit) $ 700       $ 24,400