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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings (Deficit) [Member]
Accumulated Other Comprehensive Losses [Member]
Treasury Stock [Member]
BALANCES at Dec. 31, 2014 $ 390,832 $ 709 $ 635,606 $ (216,198) $ (637) $ (28,648)
BALANCES (in shares) at Dec. 31, 2014   68,998,069        
Net income for the year 104,289     104,289    
Foreign currency translation (863)       (863)  
Stock-based compensation 10,010 $ 4 10,006      
Stock-based compensation (in shares)   396,389        
Stock repurchase (61,757)         (61,757)
Stock repurchase (in shares)   (4,651,570)        
Equity component of convertible senior notes repurchase (4,714)   (4,714)      
Unrealized holding loss on investments, net of tax 0          
Common stock issued in connection with: Stock option exercises 2,012 $ 2 2,010      
Common stock issued in connection with: Stock option exercises (in shares)   186,622        
BALANCES at Dec. 31, 2015 439,809 $ 715 642,908 (111,909) (1,500) (90,405)
BALANCES (in shares) at Dec. 31, 2015   64,929,510        
Net income for the year 119,433     119,433    
Foreign currency translation (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)    
Unrealized holding loss on investments, net of tax 0          
Common stock issued in connection with: Stock option exercises 4,831 $ 4 4,827      
Common stock issued in connection with: Stock option exercises (in shares)   417,442        
BALANCES at Dec. 31, 2016 472,391 $ 725 640,883 3,591 (2,847) (169,961)
BALANCES (in shares) at Dec. 31, 2016   60,129,631        
Net income for the year 111,422     111,422    
Foreign currency translation 487       487  
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)    
Unrealized holding loss on investments, net of tax (25)       (25)  
Common stock issued in connection with: Stock option exercises 5,790 $ 5 5,785      
Common stock issued in connection with: Stock option exercises (in shares)   511,453        
BALANCES at Dec. 31, 2017 $ 506,063 $ 737 $ 653,435 $ 98,728 $ (2,385) $ (244,452)
BALANCES (in shares) at Dec. 31, 2017   57,564,493