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Common Stock - Schedule of Share Repurchase Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Equity [Abstract]        
Shares repurchased (in shares) 0 166,972 243,894 420,357
Average price (in dollars per share) $ 0 $ 25.34 $ 28.60 $ 24.76
Aggregate value $ 0 $ 4,231 $ 6,976 $ 10,409
Magnus        
Dividends Payable [Line Items]        
Shares repurchased (in shares) 0   0