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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 |  |  |  |

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