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INCOME TAXES - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Current: |  |  |  |  |  |  |  |  |  |  |
United States-Federal |  |  |  |  |  |  |  |  | $ 504 | $ (1,559) | $ 24,546
United States-State |  |  |  |  |  |  |  |  | 3 | (336) | 4,506
Foreign |  |  |  |  |  |  |  |  | 7,611 | 8,192 | 13,060
Total current income tax expense |  |  |  |  |  |  |  |  | 8,118 | 6,297 | 42,112
Deferred: |  |  |  |  |  |  |  |  |  |  |
United States-Federal |  |  |  |  |  |  |  |  | (6,527) | (1,805) | (17,947)
United States-State |  |  |  |  |  |  |  |  | (413) | (93) | (2,832)
Foreign |  |  |  |  |  |  |  |  | (377) | (294) | (2,463)
Total deferred income tax expense (benefit) |  |  |  |  |  |  |  |  | (7,317) | (2,192) | (23,242)
Consolidated: |  |  |  |  |  |  |  |  |  |  |
United States-Federal |  |  |  |  |  |  |  |  | (6,023) | (3,364) | 6,599
United States-State |  |  |  |  |  |  |  |  | (410) | (429) | 1,674
Foreign |  |  |  |  |  |  |  |  | 7,234 | 7,898 | 10,597
Total income tax expense (benefit) | $ 1,858 | $ 92 | $ (2,258) | $ 1,109 | $ 1,332 | $ 1,834 | $ (274) | $ 1,213 | 801 | 4,105 | $ 18,870
Deferred tax assets: |  |  |  |  |  |  |  |  |  |  |
Accounts receivable and inventory allowances | 1,972 |  |  |  | 1,603 |  |  |  | 1,972 | 1,603 |
Basis in investments | 7,512 |  |  |  | 6,937 |  |  |  | 7,512 | 6,937 |
Accrued expenses | 4,701 |  |  |  | 5,923 |  |  |  | 4,701 | 5,923 |
Deferred revenue | 3,141 |  |  |  | 2,864 |  |  |  | 3,141 | 2,864 |
Employee benefits | 4,363 |  |  |  | 3,559 |  |  |  | 4,363 | 3,559 |
Other, net | 744 |  |  |  |  |  |  |  | 744 |  |
Net operating losses | 26,582 |  |  |  | 40,491 |  |  |  | 26,582 | 40,491 |
Tax Credits | 1,997 |  |  |  | 2,726 |  |  |  | 1,997 | 2,726 |
Operating lease liability | 14,648 |  |  |  | 15,869 |  |  |  | 14,648 | 15,869 |
Total deferred tax asset | 65,660 |  |  |  | 79,972 |  |  |  | 65,660 | 79,972 |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets, property and equipment | 26,736 |  |  |  | 30,419 |  |  |  | 26,736 | 30,419 |
Right-of-use asset | 14,594 |  |  |  | 15,869 |  |  |  | 14,594 | 15,869 |
Prepaid expense | 209 |  |  |  | 181 |  |  |  | 209 | 181 |
Other, net |  |  |  |  | 195 |  |  |  |  | 195 |
Total deferred tax liabilities | 41,539 |  |  |  | 46,664 |  |  |  | 41,539 | 46,664 |
Valuation allowance | (31,014) |  |  |  | (39,406) |  |  |  | (31,014) | (39,406) |
Net deferred tax liabilities | (6,893) |  |  |  | (6,098) |  |  |  | (6,893) | (6,098) |
Deferred tax assets: |  |  |  |  |  |  |  |  |  |  |
Total deferred tax asset | 3,782 |  |  |  | 2,582 |  |  |  | 3,782 | 2,582 |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |  |
Total deferred tax liabilities | (10,675) |  |  |  | (8,680) |  |  |  | (10,675) | (8,680) |
Net deferred tax liabilities | $ (6,893) |  |  |  | $ (6,098) |  |  |  | $ (6,893) | $ (6,098) |

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