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Significant Accounting Policies - Change in Accounting Policy (Details) - USD ($)
$ in Thousands
Jan. 01, 2019
Dec. 31, 2020
Apr. 01, 2020
Dec. 31, 2019
Accounting Changes        
Operating lease right-of-use assets   $ 10,275   $ 14,453
Operating lease liability   $ 10,453    
ASU 2016-02, Leases        
Accounting Changes        
Change in Accounting Principle, Accounting Standards Update, Adopted true      
New Accounting Pronouncement or Change in Accounting Principle, Prior Period Not Restated true      
Operating lease right-of-use assets $ 14,200      
Operating lease liability $ 14,200      
ASU 2019-12, Simplifying the Accounting for Income Taxes        
Accounting Changes        
Change in Accounting Principle, Accounting Standards Update, Adopted     true