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Shareholders' Equity - Summary of Shares Repurchased (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Equity [Abstract]        
Number of shares repurchased (in shares) 0 0 0 59,617,000
Average price per share (in dollars per share) $ 0 $ 0 $ 0 $ 10.65
Total cost of shares repurchased $ 0 $ 0 $ 0 $ 636,940