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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares 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, 2016 $ 60,525,000 $ 555,000 $ 8,962,000 $ (227,152,000) $ (3,000) $ 278,163,000
Balance (shares) at Dec. 31, 2016   55,489        
Purchase of treasury stock, at cost (38,735,000) $ 0 0 (38,735,000) 0 0
Stock-based compensation expense 24,345,000 0 15,508,000 8,837,000 0 0
Other 1,554,000 0 867,000 687,000 0 0
Dividends paid (65,768,000) 0 0 0 0 (65,768,000)
Unrealized gain (loss) on marketable securities, net of tax (2,000) 0 0 0 (2,000) 0
Net income 84,402,000 0 0 0 0 84,402,000
Balance at Dec. 31, 2017 66,321,000 $ 555,000 25,337,000 (256,363,000) (5,000) 296,797,000
Balance (shares) at Dec. 31, 2017   55,489        
Purchase of treasury stock, at cost (113,327,000) $ 0 0 (113,327,000) 0 0
Stock Issued During Period, Value, Share-based Compensation, Gross 0 0 5,764,000 6,619,000 0 (855,000)
Stock-based compensation expense 20,425,000 0 15,460,000 4,965,000 0 0
Other 2,256,000 0 1,719,000 537,000 0 0
Dividends paid (33,408,000) 0 0 0 0 (33,408,000)
Unrealized gain (loss) on marketable securities, net of tax (4,000) 0 0 0 (4,000) 0
Net income 135,413,000 0 0 0 0 135,413,000
Balance at Dec. 31, 2018 77,676,000 $ 555,000 36,752,000 (357,569,000) (9,000) 397,947,000
Balance (shares) at Dec. 31, 2018   55,489        
Purchase of treasury stock, at cost (203,043,000) $ 0 0 (203,043,000) 0 0
Stock Issued During Period, Value, Share-based Compensation, Gross 0 0 (7,695,000) 8,646,000 0 (951,000)
Stock-based compensation expense 23,993,000 0 16,899,000 7,094,000 0 0
Other 2,955,000 0 2,185,000 770,000 0 0
Dividends paid (48,622,000) 0 0 0 0 (48,622,000)
Unrealized gain (loss) on marketable securities, net of tax 21,000 0 0 0 21,000 0
Net income 151,099,000 0 0 0 0 151,099,000
Balance at Dec. 31, 2019 $ 4,079,000 $ 555,000 $ 48,141,000 $ (544,102,000) $ 12,000 $ 499,473,000
Balance (shares) at Dec. 31, 2019   55,489