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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Share Capital
Share Capital
Class A Stock
Contributed Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest   $ 46,557   $ 47,406 $ 496,998 $ 1,761
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of Class A non-voting common stock     $ 7,644      
Repurchase of Class A non-voting common stock for cancellation     (14,228)      
Net Income (Loss) Attributable to Parent $ 41,106       41,106  
Share-based expense       5,763    
Vested employee share plan awards       (13,381)    
Dividends paid         $ (4,597)  
Currency translation adjustment 187         187
Dividends paid per share         $ 0.36  
Stockholders' Equity Attributable to Parent   40,917   39,140 $ 519,376 1,704
Issuance of Class A non-voting common stock     1,018      
Repurchase of Class A non-voting common stock for cancellation     (1,962)      
Net Income (Loss) Attributable to Parent 15,639       15,639  
Share-based expense       1,944    
Vested employee share plan awards       (1,296)    
Dividends paid         $ (1,508)  
Currency translation adjustment 244         244
Dividends paid per share         $ 0.12  
Stockholders' Equity Attributable to Parent 615,216 39,973   39,788 $ 533,507 1,948
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 615,216 39,973   39,788 533,507 1,948
Stockholders' Equity Attributable to Parent 685,668          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest   39,333   41,481 601,406 3,448
Issuance of Class A non-voting common stock     4,846      
Repurchase of Class A non-voting common stock for cancellation     (4,715)      
Net Income (Loss) Attributable to Parent 96,067          
Share-based expense       7,827    
Vested employee share plan awards       (9,739)    
Dividends paid         $ (4,936)  
Currency translation adjustment (64)         (64)
Dividends paid per share         $ 0.39  
Stockholders' Equity Attributable to Parent   43,329   37,836 $ 668,193 3,149
Issuance of Class A non-voting common stock     850      
Repurchase of Class A non-voting common stock for cancellation     $ (4,715)      
Net Income (Loss) Attributable to Parent 26,250          
Share-based expense       2,608    
Vested employee share plan awards       (875)    
Dividends paid         $ (1,906)  
Currency translation adjustment 235         235
Dividends paid per share         $ 0.15  
Stockholders' Equity Attributable to Parent 774,954 39,464   39,569 $ 692,537 3,384
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 774,954 $ 39,464   $ 39,569 $ 692,537 $ 3,384