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Income Taxes - Tax Cuts and Jobs Act (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Provisional income tax benefit     $ 2,800
Mandatory deemed repatriation of foreign earnings     3,800
Measurement period adjustment, income tax benefit   $ 700  
Transition tax   600  
Pre-tax loss carryforwards $ 40,200 40,200  
Operating loss carryforwards, subject to expiration 200 200  
Deferred tax asset valuation allowance (11,617) (11,617) (13,254)
Increase (decrease) in the valuation allowance   $ 1,600 (2,100)
Provisional liability     3,000
Undistributed earnings of foreign subsidiaries     $ 22,400
Foreign earnings repatriated 63,000    
Taxes on foreign earnings repatriated $ 1,000