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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Beginning Balance at Dec. 31, 2010 $ 129,025 $ 703 $ 598,671 $ (444,330) $ 0 $ (26,019)
Beginning Balance (in shares) at Dec. 31, 2010   67,930,814        
Net income for the year 15,042 0 0 15,042 0 0
Foreign currency translation 0          
Stock-based compensation (in shares)   191,188        
Stock-based compensation 2,424 0 2,424 0 0 0
Stock repurchase (in shares)   (50,848)        
Stock repurchase (533) 0 0 0 0 (533)
Common stock issued in connection with:            
Public offering (in shares)   0        
Public offering (150) 0 (150) 0 0 0
Stock option plan (in shares)   94,514        
Stock option plan 538 1 537 0 0 0
Ending Balance at Dec. 31, 2011 146,346 704 601,482 (429,288) 0 (26,552)
Ending Balance (in shares) at Dec. 31, 2011   68,165,668        
Net income for the year 105,631 0 0 105,631 0 0
Foreign currency translation 248 0 0 0 248 0
Stock-based compensation (in shares)   186,368        
Stock-based compensation 4,385 (3) 4,388 0 0 0
Stock repurchase (in shares)   (54,534)        
Stock repurchase (564) 0 0 0 0 (564)
Equity component of convertible senior notes, net of taxes 12,328 0 12,328 0 0 0
Common stock issued in connection with:            
Stock option plan (in shares)   81,482        
Stock option plan 353 1 352 0 0 0
Ending Balance at Dec. 31, 2012 268,727 702 618,550 (323,657) 248 (27,116)
Ending Balance (in shares) at Dec. 31, 2012   68,378,984        
Net income for the year 46,529 0 0 46,529 0 0
Foreign currency translation (266) 0 0 0 (266) 0
Stock-based compensation (in shares)   62,183        
Stock-based compensation 6,822 0 6,822 0 0 0
Stock repurchase (in shares)   (3,665)        
Stock repurchase (35) 0 0 0 0 (35)
Common stock issued in connection with:            
Stock option plan (in shares)   85,917        
Stock option plan 602 3 599 0 0 0
Ending Balance at Dec. 31, 2013 $ 322,379 $ 705 $ 625,971 $ (277,128) $ (18) $ (27,151)
Ending Balance (in shares) at Dec. 31, 2013   68,523,419