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Income Taxes - Statutory Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes      
Statutory tax rate percentage 21.00% 21.00% 21.00%
Reconciliation of statutory tax and provision      
Expected tax at statutory rate $ (718) $ 3,026 $ 549
Foreign taxes at other rates (309) (914) (1,252)
Valuation reserves on NOL carryforwards 2,617 2,042 2,894
US tax reform - deemed repatriation     (2,534)
Global intangible low-taxed income inclusion 339 (27) 23
US tax reform - deferred tax expense from tax rate change     (462)
State income taxes, net of federal benefit 32 108 (79)
Uncertain tax positions 235 1,845 171
Disallowed expenses and other (161) 465 255
Total $ 2,035 $ 6,545 $ (435)