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INCOME TAXES - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Current: |  |  |  |  |  |  |  |  |  |  |
United States-Federal |  |  |  |  |  |  |  |  | $ (1,559) | $ 24,546 | $ 375
United States-State |  |  |  |  |  |  |  |  | (336) | 4,506 | 500
Foreign |  |  |  |  |  |  |  |  | 8,192 | 13,060 | 11,289
Total current income tax expense |  |  |  |  |  |  |  |  | 6,297 | 42,112 | 12,164
Deferred: |  |  |  |  |  |  |  |  |  |  |
United States-Federal |  |  |  |  |  |  |  |  | (1,805) | (17,947) | (10,892)
United States-State |  |  |  |  |  |  |  |  | (93) | (2,832) | 950
Foreign |  |  |  |  |  |  |  |  | (294) | (2,463) | (3,563)
Total deferred income tax expense (benefit) |  |  |  |  |  |  |  |  | (2,192) | (23,242) | (13,505)
Consolidated: |  |  |  |  |  |  |  |  |  |  |
United States-Federal |  |  |  |  |  |  |  |  | (3,364) | 6,599 | (10,517)
United States-State |  |  |  |  |  |  |  |  | (429) | 1,674 | 1,450
Foreign |  |  |  |  |  |  |  |  | 7,898 | 10,597 | 7,726
Total income tax expense (benefit) | $ 1,332 | $ 1,834 | $ (274) | $ 1,213 | $ 5,851 | $ 7,010 | $ 2,088 | $ 3,921 | 4,105 | 18,870 | $ (1,341)
Deferred tax assets: |  |  |  |  |  |  |  |  |  |  |
Receivables reserve | 1,192 |  |  |  | 3,087 |  |  |  | 1,192 | 3,087 |
Temporary differences not currently deductible for tax | 13,144 |  |  |  | 9,035 |  |  |  | 13,144 | 9,035 |
Deferred compensation | 760 |  |  |  | 784 |  |  |  | 760 | 784 |
Operating lease liability | 15,869 |  |  |  |  |  |  |  | 15,869 |  |
Pension | 515 |  |  |  | 635 |  |  |  | 515 | 635 |
Net operating losses | 40,492 |  |  |  | 29,496 |  |  |  | 40,492 | 29,496 |
Tax Credits | 1,511 |  |  |  | 645 |  |  |  | 1,511 | 645 |
Total deferred tax asset | 73,483 |  |  |  | 43,682 |  |  |  | 73,483 | 43,682 |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net | 15,892 |  |  |  | 14,608 |  |  |  | 15,892 | 14,608 |
Right-of-use asset | 15,869 |  |  |  |  |  |  |  | 15,869 |  |
Intangible assets, net | 8,414 |  |  |  | 5,959 |  |  |  | 8,414 | 5,959 |
Total deferred tax liabilities | 40,175 |  |  |  | 20,567 |  |  |  | 40,175 | 20,567 |
Valuation allowance | (39,406) |  |  |  | (31,442) |  |  |  | (39,406) | (31,442) |
Net deferred tax liabilities | (6,098) |  |  |  | (8,327) |  |  |  | (6,098) | (8,327) |
Deferred tax assets: |  |  |  |  |  |  |  |  |  |  |
Total deferred tax asset | 2,582 |  |  |  | 1,949 |  |  |  | 2,582 | 1,949 |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |  |
Total deferred tax liabilities | (8,680) |  |  |  | (10,276) |  |  |  | (8,680) | (10,276) |
Net deferred tax liabilities | $ (6,098) |  |  |  | $ (8,327) |  |  |  | $ (6,098) | $ (8,327) |

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