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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings [Member]
Balance at Dec. 31, 2017 $ 66,321 $ 555 $ 25,337 $ (256,363) $ (5) $ 296,797
Balance (shares) at Dec. 31, 2017   55,489        
Purchase of treasury stock, at cost (113,327) $ 0 0 (113,327) 0 0
Stock Issued During Period, Value, Share-based Compensation, Gross 0 0 (5,764) 6,619 0 (855)
Stock-based compensation expense 20,425 0 15,460 4,965 0 0
Other 2,256 0 1,719 537 0 0
Dividends paid (33,408) 0 0 0 0 (33,408)
Unrealized gain (loss) on marketable securities, net of tax (4) 0 0 0 (4) 0
Net income 135,413 0 0 0 0 135,413
Balance at Dec. 31, 2018 77,676 $ 555 36,752 (357,569) (9) 397,947
Balance (shares) at Dec. 31, 2018   55,489        
Purchase of treasury stock, at cost (203,043) $ 0 0 (203,043) 0 0
Stock Issued During Period, Value, Share-based Compensation, Gross 0 0 (7,695) 8,646 0 (951)
Stock-based compensation expense 23,993 0 16,899 7,094 0 0
Other 2,955 0 2,185 770 0 0
Dividends paid (48,622) 0 0 0 0 (48,622)
Unrealized gain (loss) on marketable securities, net of tax 21 0 0 0 21 0
Net income 151,099 0 0 0 0 151,099
Balance at Dec. 31, 2019 4,079 $ 555 48,141 (544,102) 12 499,473
Balance (shares) at Dec. 31, 2019   55,489        
Purchase of treasury stock, at cost (99,415) $ 0 0 (99,415) 0 0
Stock Issued During Period, Value, Share-based Compensation, Gross 0 0 (7,140) 7,953 0 (813)
Stock-based compensation expense 60,145 0 53,561 6,584 0 0
Other 2,962 0 966 1,996 0 0
Dividends paid (61,869) 0 0 0 0 (61,869)
Unrealized gain (loss) on marketable securities, net of tax (7) 0 0 0 (7) 0
Net income 138,237 0 0 0 0 138,237
Balance at Dec. 31, 2020 $ 44,132 $ 555 $ 95,528 $ (626,984) $ 5 $ 575,028
Balance (shares) at Dec. 31, 2020   55,489