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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Total
Additional Paid-in Capital
Accumulated Other Comprehensive Income, Net of Deferred Income Tax
Retained Earnings
Treasury Shares
Class A Common Shares
Class A Common Shares
Treasury Shares
Series A Cumulative Fixed Rate Preferred Shares
Class B Common Shares
Number at Dec. 31, 2018         76,642 10,171,954     4,133,366
Class A common shares purchased             27,028    
Retirement of shares         6,779        
Preferred shares issued               0  
Common shares issued / (forfeited) under share incentive plans           36,180      
Common shares issued to directors           50,661      
Reduction in treasury shares due to redomestication         0 0      
Number at Sep. 30, 2019         110,449 10,258,795   0 4,133,366
Balance at Dec. 31, 2018   $ 438,182 $ (21,231) $ 215,132 $ (3,026) $ 1     $ 1
Class A common shares purchased, at cost             $ (947)    
Reduction in par due to redomestication           0     0
Reduction in treasury shares due to redomestication   0     0        
Other comprehensive income (loss):                  
Change in unrealized holding gains (losses)     46,218            
Change in other than temporary impairment losses recognized in other comprehensive income (loss) $ (4)   (4)            
Unrealized foreign currency translation gains 331   331            
Other comprehensive income (loss), net of tax 46,545   46,545            
Cumulative effect adjustment resulting from adoption of new accounting guidance       (5)          
Net income (loss) 40,984     40,984          
Preferred share distributions       0          
Dividends/ Distribution to shareholders       (10,765)          
Share compensation plans   2,513              
Preferred shares issued               $ 0  
Balance at Sep. 30, 2019 707,384 440,695 25,314 245,346 $ (3,973) $ 1   $ 0 $ 1
Number at Jun. 30, 2019         110,449 10,239,520     4,133,366
Class A common shares purchased             0    
Retirement of shares         0        
Preferred shares issued               0  
Common shares issued / (forfeited) under share incentive plans           0      
Common shares issued to directors           19,275      
Reduction in treasury shares due to redomestication         0 0      
Number at Sep. 30, 2019         110,449 10,258,795   0 4,133,366
Balance at Jun. 30, 2019   439,707 16,542 242,234 $ (3,973) $ 1     $ 1
Class A common shares purchased, at cost             $ 0    
Reduction in par due to redomestication           0     0
Reduction in treasury shares due to redomestication   0     0        
Other comprehensive income (loss):                  
Change in unrealized holding gains (losses)     8,574            
Change in other than temporary impairment losses recognized in other comprehensive income (loss) (2)   (2)            
Unrealized foreign currency translation gains 200   200            
Other comprehensive income (loss), net of tax 8,772   8,772            
Cumulative effect adjustment resulting from adoption of new accounting guidance       0          
Net income (loss) 6,721     6,721          
Preferred share distributions       0          
Dividends/ Distribution to shareholders       (3,609)          
Share compensation plans   988              
Preferred shares issued               $ 0  
Balance at Sep. 30, 2019 707,384 440,695 25,314 245,346 $ (3,973) $ 1   $ 0 $ 1
Number at Dec. 31, 2019         115,221 10,282,277     4,133,366
Class A common shares purchased             5,120    
Retirement of shares         159        
Preferred shares issued               4,000  
Common shares issued / (forfeited) under share incentive plans           (576)      
Common shares issued to directors           81,502      
Reduction in treasury shares due to redomestication         (120,500) (120,500)      
Number at Sep. 30, 2020         0 10,242,703   4,000 4,133,366
Balance at Dec. 31, 2019 726,809 442,403 17,609 270,768 $ (3,973) $ 1     $ 1
Class A common shares purchased, at cost             $ (153)    
Reduction in par due to redomestication           (1)     (1)
Reduction in treasury shares due to redomestication   (4,126)     4,126        
Other comprehensive income (loss):                  
Change in unrealized holding gains (losses)     17,543            
Change in other than temporary impairment losses recognized in other comprehensive income (loss) 0   0            
Unrealized foreign currency translation gains 568   568            
Other comprehensive income (loss), net of tax 18,111   18,111            
Cumulative effect adjustment resulting from adoption of new accounting guidance       0          
Net income (loss) (22,197)     (22,197)          
Preferred share distributions (42)     (42)          
Dividends/ Distribution to shareholders       (10,973)          
Share compensation plans   5,160              
Preferred shares issued               $ 4,000  
Balance at Sep. 30, 2020 720,713 443,437 35,720 237,556 $ 0 $ 0   $ 4,000 $ 0
Number at Jun. 30, 2020         120,104 10,333,540     4,133,366
Class A common shares purchased             396    
Retirement of shares         0        
Preferred shares issued               4,000  
Common shares issued / (forfeited) under share incentive plans           (230)      
Common shares issued to directors           29,893      
Reduction in treasury shares due to redomestication         (120,500) (120,500)      
Number at Sep. 30, 2020         0 10,242,703   4,000 4,133,366
Balance at Jun. 30, 2020   445,173 37,693 256,442 $ (4,116) $ 1     $ 1
Class A common shares purchased, at cost             $ (10)    
Reduction in par due to redomestication           (1)     (1)
Reduction in treasury shares due to redomestication   (4,126)     4,126        
Other comprehensive income (loss):                  
Change in unrealized holding gains (losses)     (2,552)            
Change in other than temporary impairment losses recognized in other comprehensive income (loss) 0   0            
Unrealized foreign currency translation gains 579   579            
Other comprehensive income (loss), net of tax (1,973)   (1,973)            
Cumulative effect adjustment resulting from adoption of new accounting guidance       0          
Net income (loss) (15,170)     (15,170)          
Preferred share distributions (42)     (42)          
Dividends/ Distribution to shareholders       (3,674)          
Share compensation plans   2,390              
Preferred shares issued               $ 4,000  
Balance at Sep. 30, 2020 $ 720,713 $ 443,437 $ 35,720 $ 237,556 $ 0 $ 0   $ 4,000 $ 0