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INCOME TAXES - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |  |  |  |  |  |  |  |  |
United States-Federal |  |  |  |  |  |  |  |  | $ 375 | $ 15,763 | $ (1,308)
United States-State |  |  |  |  |  |  |  |  | 500 | 505 | (383)
Foreign |  |  |  |  |  |  |  |  | 11,289 | 10,528 | 7,959
Total current income tax expense |  |  |  |  |  |  |  |  | 12,164 | 26,796 | 6,268
Deferred: |  |  |  |  |  |  |  |  |  |  |
United States-Federal |  |  |  |  |  |  |  |  | (10,892) | (1,880) | 16,760
United States-State |  |  |  |  |  |  |  |  | 950 | (291) | 1,636
Foreign |  |  |  |  |  |  |  |  | (3,563) | (3,465) | (527)
Total deferred income tax expense (benefit) |  |  |  |  |  |  |  |  | (13,505) | (5,636) | 17,869
Consolidated: |  |  |  |  |  |  |  |  |  |  |
United States-Federal |  |  |  |  |  |  |  |  | (10,517) | 13,883 | 15,452
United States-State |  |  |  |  |  |  |  |  | 1,450 | 214 | 1,253
Foreign |  |  |  |  |  |  |  |  | 7,726 | 7,063 | 7,432
Total Income Tax Expense | $ (6,181) | $ (884) | $ 2,596 | $ 3,128 | $ 3,982 | $ 9,602 | $ 2,945 | $ 4,631 | (1,341) | 21,160 | $ 24,137
Deferred tax assets: |  |  |  |  |  |  |  |  |  |  |
Receivables reserve | 1,524 |  |  |  | 1,470 |  |  |  | 1,524 | 1,470 |
Temporary differences not currently deductible for tax | 7,869 |  |  |  | 8,918 |  |  |  | 7,869 | 8,918 |
Deferred compensation | 1,446 |  |  |  | 2,461 |  |  |  | 1,446 | 2,461 |
Pension | 245 |  |  |  | 1,085 |  |  |  | 245 | 1,085 |
Net operating losses | 26,685 |  |  |  | 29,571 |  |  |  | 26,685 | 29,571 |
Tax Credits | 8,969 |  |  |  |  |  |  |  | 8,969 |  |
Total deferred tax asset | 46,738 |  |  |  | 43,505 |  |  |  | 46,738 | 43,505 |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net | 35,630 |  |  |  | 41,136 |  |  |  | 35,630 | 41,136 |
Intangible assets, net | 5,817 |  |  |  | 6,122 |  |  |  | 5,817 | 6,122 |
Total deferred tax liabilities | 41,447 |  |  |  | 47,258 |  |  |  | 41,447 | 47,258 |
Valuation allowance | (35,829) |  |  |  | (42,462) |  |  |  | (35,829) | (42,462) |
Net deferred tax liabilities | (30,538) |  |  |  | (46,215) |  |  |  | (30,538) | (46,215) |
Deferred tax assets: |  |  |  |  |  |  |  |  |  |  |
Long term and total deferred tax asset | 1,194 |  |  |  | 407 |  |  |  | 1,194 | 407 |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |  |
Long term and total deferred tax liabilities | (31,732) |  |  |  | (46,622) |  |  |  | (31,732) | (46,622) |
Net deferred tax liabilities | $ (30,538) |  |  |  | $ (46,215) |  |  |  | $ (30,538) | $ (46,215) |

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