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INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets |  |
Stock-based compensation | $ 2,528 | $ 2,130
Net operating loss and tax credit carryforwards | 54,210 | 57,590
Interest expense limitation | 7,344 | 7,344
Pension obligation | 10,778 | 14,297
Excess and obsolete inventory | 3,325 | 3,722
Accrued restructuring | 2,223 | 2,468
Deferred revenue | 4,195 | 3,048
Employee bonuses and commissions | 3,861 | 5,388
Amortization | 26,358 | 28,786
Operating lease liabilities | 19,405 | 20,267
Other | 8,017 | 8,925
Deferred tax assets | 142,244 | 153,965
Less: Valuation allowance | (42,051) | (46,702)
Net deferred tax assets | 100,193 | 107,263
Deferred tax liabilities |  |
Depreciation and amortization | 37,515 | 40,266
Unremitted earnings | 4,435 | 4,173
Operating lease right-of-use assets | 17,558 | 18,731
Other | 3,364 | 3,380
Deferred tax liabilities | 62,872 | 66,550
Net deferred tax assets | 37,321 | 40,713
Deferred income tax assets | 47,242 | 50,801
Deferred income tax liabilities | $ 9,921 | $ 10,088

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