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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     $ 6,626      
Repurchase of Class A non-voting common stock for cancellation     (12,266)      
Net Income (Loss) Attributable to Parent $ 25,467       25,467  
Share-based expense       3,819    
Vested employee share plan awards       (12,085)    
Dividends paid         $ (3,089)  
Currency translation adjustment (57)         (57)
Dividends paid per share         $ 0.24  
Stockholders' Equity Attributable to Parent   44,306   37,945 $ 503,255 1,224
Issuance of Class A non-voting common stock     443      
Repurchase of Class A non-voting common stock for cancellation     (3,832)      
Net Income (Loss) Attributable to Parent 17,649       17,649  
Share-based expense       1,757    
Vested employee share plan awards       (562)    
Dividends paid         $ (1,528)  
Currency translation adjustment 480         480
Dividends paid per share         $ 0.12  
Stockholders' Equity Attributable to Parent 601,137 40,917   39,140 $ 519,376 1,704
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 601,137 40,917   39,140 519,376 1,704
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     3,996      
Repurchase of Class A non-voting common stock for cancellation     0      
Net Income (Loss) Attributable to Parent 69,817          
Share-based expense       5,219    
Vested employee share plan awards       (8,864)    
Dividends paid         $ (3,030)  
Currency translation adjustment (299)         (299)
Dividends paid per share         $ 0.24  
Stockholders' Equity Attributable to Parent   43,141   35,429 $ 638,558 2,612
Issuance of Class A non-voting common stock     188      
Repurchase of Class A non-voting common stock for cancellation     $ 0      
Net Income (Loss) Attributable to Parent 31,159          
Share-based expense       2,759    
Vested employee share plan awards       (352)    
Dividends paid         $ (1,524)  
Currency translation adjustment 537         537
Dividends paid per share         $ 0.12  
Stockholders' Equity Attributable to Parent 752,507 43,329   37,836 $ 668,193 3,149
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 752,507 $ 43,329   $ 37,836 $ 668,193 $ 3,149