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Income Taxes - Deferred Income Tax Balances (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Stock and long-term compensation plans $ 2,450 $ 2,405
Foreign NOL & other carryforwards 29,267 24,867
US state NOL carryforwards 718 670
Deferred revenue 671 684
Pension liability 2,074 1,509
Amortization and depreciation 167 586
Lease liability 3,837 2,807
Accrued expenses and other 1,264 1,013
Total gross deferred tax assets 40,448 34,541
Less: Valuation allowance (19,992) (17,255)
Net deferred tax assets (liabilities) 20,456 17,286
Deferred tax liabilities:    
Accruals 286 741
Tax on unremitted foreign earnings 1,809 2,058
Right of use asset 3,251 2,124
Intangible assets 6,135 8,046
Tax on credits 2,241 627
Contract acquisition costs 1,616 450
Deferred tax liabilities 15,338 14,046
Net deferred tax assets (liabilities) $ 5,118 $ 3,240