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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Class A Common Stock
Class B Convertible Common Stock
Additional Paid-in Capital
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Beginning Balance at Dec. 31, 2012 $ 200,311 $ 15 $ 2 $ 468,087 $ (475,184) $ (1,515) $ 208,906
Beginning Balance (in shares) at Dec. 31, 2012   15,462 2,227   (6,405)    
Net income (loss) 83,332 $ 0 $ 0 0 $ 0 0 83,332
Other comprehensive income 684 0 0 0 0 684 0
Translation gain released to other income 0            
Issuance of class A common stock under stock option plans $ 341 $ 0 $ 0 341 $ 0 0 0
Issuance of class A common stock under stock option plans (in shares) 16 16 0   0    
Tax effect of stock option exercises $ 23,580 $ 0 $ 0 23,580 $ 0 0 0
Share-based compensation expense 2,078 0 0 2,078 0 0 0
Ending Balance at Dec. 31, 2013 310,326 $ 15 $ 2 494,086 $ (475,184) (831) 292,238
Ending Balance (in shares) at Dec. 31, 2013   15,478 2,227   (6,405)    
Net income (loss) 5,035 $ 0 $ 0 0 $ 0 0 5,035
Other comprehensive income (3,532) 0 0 0 0 (3,532) 0
Translation gain released to other income 0            
Conversion of class B to class A common stock 0 $ 0 $ 0 0 $ 0 0 0
Conversion of class B to class A common stock (in shares)   172 (172)   0    
Issuance of class A common stock under stock option plans $ 856 $ 1 $ 0 855 $ 0 0 0
Issuance of class A common stock under stock option plans (in shares) 9 10 0   0    
Share-based compensation expense $ 11,786 $ 0 $ 0 11,786 $ 0 0 0
Ending Balance at Dec. 31, 2014 324,471 $ 16 $ 2 506,727 $ (475,184) (4,363) 297,273
Ending Balance (in shares) at Dec. 31, 2014   15,660 2,055   (6,405)    
Net income (loss) 105,931 $ 0 $ 0 0 $ 0 0 105,931
Other comprehensive income (2,765) 0 0 0 0 (2,765) 0
Translation gain released to other income (280) 0 0 0 0 (280) 0
Conversion of class B to class A common stock 0 $ 0 $ 0 0 $ 0 0 0
Conversion of class B to class A common stock (in shares)   20 (20)   0    
Issuance of class A common stock under stock option plans $ 9,529 $ 0 $ 0 9,529 $ 0 0 0
Issuance of class A common stock under stock option plans (in shares) 91 91 0   0    
Tax effect of stock option exercises $ 1,096 $ 0 $ 0 1,096 $ 0 0 0
Share-based compensation expense 17,299 0 0 17,299 0 0 0
Ending Balance at Dec. 31, 2015 $ 455,281 $ 16 $ 2 $ 534,651 $ (475,184) $ (7,408) $ 403,204
Ending Balance (in shares) at Dec. 31, 2015   15,771 2,035   (6,405)