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INCOME TAXES Table 2 - Tax Effects of Temporary Differences (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred income tax assets:    
Net operating losses $ 20,688 $ 31,539
Employee benefits 483 697
Environmental and legal reserves 185 148
Allowance for bad debt 1,982 2,697
Other 2,050 1,697
Total deferred income tax assets 25,388 36,778
Less: Valuation allowance (11,251) (12,759)
Net deferred income tax assets 14,137 24,019
Deferred income tax liabilities:    
Property, plant and equipment (36,176) (43,788)
Foreign withholding tax 0 (384)
Total deferred income tax liabilities (36,176) (44,172)
Net deferred income tax liability (22,039) (20,153)
Reported on the Consolidated Balance Sheets as:    
Deferred income tax asset 233 2,051
Deferred income tax liability (22,272) (22,204)
Net deferred income tax liability $ (22,039) $ (20,153)