v3.21.2
Shareholders' Equity - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
May 06, 2021
Mar. 03, 2021
Dec. 31, 2020
Feb. 21, 2017
Class of Stock [Line Items]                
Common stock, shares authorized (in shares) 150,000,000   150,000,000          
Common stock, shares issued (in shares) 92,233,783   92,233,783       89,815,175  
Common stock, shares outstanding (in shares) 86,420,221   86,420,221       84,801,161  
Preference shares issued (in shares) 18,600,000   18,600,000          
Preference shares outstanding (in shares) 18,600,000   18,600,000          
Undesignated shares (in shares) 39,166,217   39,166,217          
Preference shares outstanding, held by non-affiliates (in shares) 7,255,368   7,255,368          
Shares repurchased for tax withholding (in shares) 0 834 799,548 834        
Shares repurchased for tax withholding, price per share (in dollars per share)   $ 1.13 $ 2.95 $ 1.13        
Stock repurchase program, remaining authorized repurchase amount             $ 74,245,000  
Treasury shares repurchased (in shares) 0 0 0 0        
Preference shares - Series A, C and D                
Class of Stock [Line Items]                
Stock repurchased, authorized amount (up to)         $ 50,000,000 $ 100,000,000    
Stock repurchase program, remaining authorized repurchase amount $ 25,342,000   $ 25,342,000          
Common shares                
Class of Stock [Line Items]                
Stock repurchased, authorized amount (up to)               $ 100,000,000
Stock repurchase program, remaining authorized repurchase amount $ 74,245,000   $ 74,245,000