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Unrecognized Tax Benefits Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]        
Unrecognized Tax Benefits $ 1,667 $ 0 $ 0 $ 0
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions 1,667 0 0  
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions 0 0 0  
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions 0 0 0  
Tax Adjustments, Settlements, and Unusual Provisions 0 0 0  
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations $ 0 $ 0 $ 0