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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