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Summary of Significant Accounting Policies ASU Adjustment (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2019
Dec. 31, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Right-of-use assets obtained in exchange for new operating lease liabilities   $ 745 $ 25,400
Accounting Standards Update 2016-02 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Right-of-use assets obtained in exchange for new operating lease liabilities $ 50,000