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INCOME TAXES - Schedule of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
INCOME TAXES |  |
Stock-based compensation | $ 2,130 | $ 1,757
Net operating loss and tax credit carryforwards | 57,590 | 86,879
Interest expense limitation | 7,344 | 7,620
Pension obligation | 14,297 | 13,473
Excess and obsolete inventory | 3,722 | 3,217
Accrued restructuring | 2,468 |
Deferred revenue | 3,048 | 3,305
Employee bonuses and commissions | 5,388 | 2,537
Depreciation and Amortization | 28,786 | 29,015
Operating lease liabilities | 20,267 | 23,451
Other | 8,925 | 9,685
Deferred tax assets | 153,965 | 180,939
Less: Valuation allowance | (46,702) | (76,206)
Net deferred tax assets | 107,263 | 104,733
Depreciation and amortization | 40,266 | 41,549
Unremitted earnings | 4,173 | 4,740
Operating lease right-of-use assets | 18,731 | 22,774
Other | 3,380 | 2,966
Deferred tax liabilities | 66,550 | 72,029
Net deferred tax assets | 40,713 | 32,704
Deferred income tax assets | 50,801 | 42,656
Deferred income tax liabilities | $ 10,088 | $ 9,952

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