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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Class A
Class B Convertible
Additional Paid-in Capital
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Beginning Balance at Dec. 31, 2014 $ 324,471 $ 16 $ 2 $ 506,727 $ (475,184) $ (4,363) $ 297,273
Beginning Balance (in shares) at Dec. 31, 2014   15,660 2,055   (6,405)    
Net income 105,931 $ 0 $ 0 0 $ 0 0 105,931
Other comprehensive gain (loss) (2,765) 0 0 0 0 (2,765) 0
Translation gain reclassified 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)    
Net income 90,908 $ 0 $ 0 0 $ 0 0 90,908
Other comprehensive gain (loss) (3,335) 0 0 0 0 (3,335) 0
Translation gain reclassified to other income 0            
Issuance of class A common stock under stock option plans $ 1,663 $ 0 $ 0 1,663 $ 0 0 0
Issuance of class A common stock under stock option plans (in shares) 112 34 0   0    
Tax effect of stock option exercises $ 1,244 $ 0 $ 0 1,244 $ 0 0 0
Share-based compensation expense 11,817 0 0 11,817 0 0 0
Payment of taxes relating to net exercise of employee stock options (3,739) 0 0 (3,739) 0 0 0
Write-off of deferred tax assets relating to vested employee stock options that are no longer exercisable (1,662) 0 0 (1,662) 0 0 0
Ending Balance at Dec. 31, 2016 552,177 $ 16 $ 2 543,974 $ (475,184) (10,743) 494,112
Ending Balance (in shares) at Dec. 31, 2016   15,805 2,035   (6,405)    
Net income 17,643 $ 0 $ 0 0 $ 0 0 17,643
Other comprehensive gain (loss) 4,775 0 0 0 0 4,775 0
Translation gain reclassified to other income 0            
Issuance of class A common stock under stock option plans $ 1,677 $ 0 $ 0 1,677 $ 0 0 0
Issuance of class A common stock under stock option plans (in shares) 12 12 0   0    
Share-based compensation expense $ 14,267 $ 0 $ 0 14,267 $ 0 0 0
Ending Balance at Dec. 31, 2017 $ 590,539 $ 16 $ 2 $ 559,918 $ (475,184) $ (5,968) $ 511,755
Ending Balance (in shares) at Dec. 31, 2017   15,817 2,035   (6,405)