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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings (Deficit)
Accumulated Other Comprehensive Losses
Treasury Stock
Balance beginning of period (in shares) at Dec. 31, 2016   60,129,631        
Balance at beginning of period at Dec. 31, 2016 $ 472,391 $ 725 $ 640,883 $ 3,591 $ (2,847) $ (169,961)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income for the year 111,422     111,422    
Foreign currency translation and other 462       462  
Stock-based compensation (in shares)   650,218        
Stock-based compensation 10,429 $ 7 10,422      
Stock repurchase (in shares)   (3,726,809)        
Stock repurchase (74,491)         (74,491)
Equity component of convertible senior notes repurchase (3,655)   (3,655)      
Common stock dividends (16,285)     (16,285)    
Stock option exercises (in shares)   511,453        
Stock option exercises 5,790 $ 5 5,785      
Balance end of period (in shares) at Dec. 31, 2017   57,564,493        
Balance at end of period at Dec. 31, 2017 506,063 $ 737 653,435 98,728 (2,385) (244,452)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income for the year 69,421     69,421    
Foreign currency translation and other (193)       (193)  
Stock-based compensation (in shares)   404,628        
Stock-based compensation 10,169 $ 6 10,163      
Stock repurchase (in shares)   (2,935,978)        
Stock repurchase (58,383)         (58,383)
Equity component of convertible senior notes repurchase (35,519)   (35,519)      
Common stock dividends (17,905)     (17,905)    
Unrealized loss on derivative instruments, net of tax (765)       (765)  
Stock option exercises (in shares)   102,645        
Stock option exercises 961 $ 1 960      
Balance end of period (in shares) at Dec. 31, 2018   55,135,788        
Balance at end of period at Dec. 31, 2018 473,849 $ 744 629,039 150,244 (3,343) (302,835)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income for the year 89,575     89,575    
Foreign currency translation and other 712       712  
Stock-based compensation (in shares)   319,430        
Stock-based compensation 9,036 $ 5 9,031      
Stock repurchase (in shares)   (2,072,798)        
Stock repurchase (33,707)         (33,707)
Common stock dividends (17,978)     (17,978)    
Unrealized loss on derivative instruments, net of tax $ (1,347)       (1,347)  
Stock option exercises (in shares) 91,200 91,200        
Stock option exercises $ 848 $ 1 847      
Balance end of period (in shares) at Dec. 31, 2019   53,473,620        
Balance at end of period at Dec. 31, 2019 $ 520,988 $ 750 $ 638,917 $ 221,841 $ (3,978) $ (336,542)