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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 at beginning of period at Dec. 31, 2015 $ 439,809 $ 715 $ 642,908 $ (111,909) $ (1,500) $ (90,405)
Balance beginning of period (in shares) at Dec. 31, 2015   64,929,510        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income for the year 119,433     119,433    
Foreign currency translation and other (1,347)       (1,347)  
Stock-based compensation 12,037 $ 6 12,031      
Stock-based compensation (in shares)   615,066        
Stock repurchase (79,556)         (79,556)
Stock repurchase (in shares)   (5,832,387)        
Equity component of convertible senior notes repurchase (18,883)   (18,883)      
Common stock dividends (3,933)     (3,933)    
Stock option exercises 4,831 $ 4 4,827      
Stock option exercises (in shares)   417,442        
Balance at end of period at Dec. 31, 2016 472,391 $ 725 640,883 3,591 (2,847) (169,961)
Balance end of period (in shares) at Dec. 31, 2016   60,129,631        
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 10,429 $ 7 10,422      
Stock-based compensation (in shares)   650,218        
Stock repurchase (74,491)         (74,491)
Stock repurchase (in shares)   (3,726,809)        
Equity component of convertible senior notes repurchase (3,655)   (3,655)      
Common stock dividends (16,285)     (16,285)    
Stock option exercises 5,790 $ 5 5,785      
Stock option exercises (in shares)   511,453        
Balance at end of period at Dec. 31, 2017 506,063 $ 737 653,435 98,728 (2,385) (244,452)
Balance end of period (in shares) at Dec. 31, 2017   57,564,493        
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 10,169 $ 6 10,163      
Stock-based compensation (in shares)   404,628        
Stock repurchase (58,383)         (58,383)
Stock repurchase (in shares)   (2,935,978)        
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 961 $ 1 960      
Stock option exercises (in shares)   102,645        
Balance at end of period at Dec. 31, 2018 $ 473,849 $ 744 $ 629,039 $ 150,244 $ (3,343) $ (302,835)
Balance end of period (in shares) at Dec. 31, 2018   55,135,788