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Income Taxes Income taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Unrecognized Tax Benefit [Roll Forward]        
Beginning Balance $ 1,150 $ 1,511 $ 361  
Additions related to current period tax positions 0 0 1,150  
Reductions for tax positions of prior years 0 (361) 0  
Ending Balance 2,295 1,150 1,511  
Valuation Allowance 4,968 2,230 649 $ 0
Deferred Tax Liabilities, Undistributed Foreign Earnings 2,964 3,025    
Deferred Income Tax Expense (Benefit) $ (8,353) 5,144 (2,822)  
Effective Income Tax Rate Reconciliation, GILTI (18.20%)      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 2,738 $ 1,581 $ 649