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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, 2017 $ 605,726 $ 16 $ 2 $ 559,918 $ (475,184) $ (5,659) $ 526,633
Beginning Balance (in shares) at Dec. 31, 2017   15,817 2,035   (6,405)    
Net (loss) income 22,501 $ 0 $ 0 0 $ 0 0 22,501
Other comprehensive income (loss) (4,558) 0 0 0 0 (4,558) 0
Issuance of class A common stock under stock option plans 2,471 $ 0 $ 0 2,471 $ 0 0 0
Issuance of class A common stock under stock option plans (in shares)   20 0   0    
Purchases of treasury stock (110,977) $ 0 $ 0 0 $ (110,977) 0 0
Purchases of treasury stock (in shares)   0 0   (880)    
Share-based compensation expense 14,568 $ 0 $ 0 14,568 $ 0 0 0
Ending Balance at Dec. 31, 2018 529,731 $ 16 $ 2 576,957 $ (586,161) (10,217) 549,134
Ending Balance (in shares) at Dec. 31, 2018   15,837 2,035   (7,285)    
Net (loss) income 34,355 $ 0 $ 0 0 $ 0 0 34,355
Other comprehensive income (loss) 566 0 0 0 0 566 0
Issuance of class A common stock under stock option plans 6,569 $ 0 $ 0 6,569 $ 0 0 0
Issuance of class A common stock under stock option plans (in shares)   51 0   0    
Purchases of treasury stock (72,719) $ 0 $ 0 0 $ (72,719) 0 0
Purchases of treasury stock (in shares)   0 0   (522)    
Share-based compensation expense 10,057 $ 0 $ 0 10,057 $ 0 0 0
Ending Balance at Dec. 31, 2019 508,559 $ 16 $ 2 593,583 $ (658,880) (9,651) 583,489
Ending Balance (in shares) at Dec. 31, 2019   15,888 2,035   (7,807)    
Net (loss) income (7,524) $ 0 $ 0 0 $ 0 0 (7,524)
Other comprehensive income (loss) 5,766 0 0 0 0 5,766 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)   71 (71)        
Issuance of class A common stock under stock option plans 51,082 $ 0 $ 0 51,082 $ 0 0 0
Issuance of class A common stock under stock option plans (in shares)   348 0   0    
Purchases of treasury stock (123,224) $ 0 $ 0 0 $ (123,224) 0 0
Purchases of treasury stock (in shares)   0 0   (877)    
Share-based compensation expense 10,576 $ 0 $ 0 10,576 $ 0 0 0
Equity component of convertible senior notes, net of issuance cost and deferred tax liability 107,810 0 0 107,810 0 0 0
Ending Balance at Dec. 31, 2020 $ 553,045 $ 16 $ 2 $ 763,051 $ (782,104) $ (3,885) $ 575,965
Ending Balance (in shares) at Dec. 31, 2020   16,307 1,964   (8,684)