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Recently Issued Financial Accounting Standards (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
New Financial Accounting Standards                
Cumulative effect on retained earnings, net of tax $ 933,837 $ 928,847 $ 939,798 $ 949,944 $ 949,241 $ 950,675 $ 940,111 $ 932,775
Retained Earnings                
New Financial Accounting Standards                
Cumulative effect on retained earnings, net of tax $ 342,425 $ 345,434 $ 364,492 368,221 $ 373,174 $ 376,572 $ 369,713 363,425
Reclassify upon adoption of ASU                
New Financial Accounting Standards                
Cumulative effect on retained earnings, net of tax       (575)       93
Reclassify upon adoption of ASU | Retained Earnings                
New Financial Accounting Standards                
Cumulative effect on retained earnings, net of tax       (575)       $ 93
Reclassify upon adoption of ASU | ASU 2016-13 | Retained Earnings                
New Financial Accounting Standards                
Cumulative effect on retained earnings, net of tax       $ (575)