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Significant Accounting Policies Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative effect of accounting change     $ (29,252)   $ (14,672)
Debt Securities, Threshold Period Past Due 90 days        
Operating Lease, Right-of-Use Asset $ 298,600   297,700 $ 170,500  
Operating Lease, Liability $ 328,900   323,700 174,400  
Retained Earnings [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative effect of accounting change   $ (29,300) $ (29,252) $ (14,700) $ (14,672)