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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Treasury Stock [Member] | Retained Earnings [Member]
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 77,676 | $ 555 | $ 36,752 | $ (357,569) | $ 397,938
Balance (shares) at Dec. 31, 2018 |  | 55,489 |  |  |
Purchase of treasury stock, at cost | (38,796) | $ 0 | 0 | (38,796) | 0
Issuance of long-term incentive awards and dividend equivalents | 0 | 0 | (7,695) | 8,646 | (951)
Stock-based compensation expense | 14,296 | 0 | 10,776 | 3,520 | 0
Other | 1,545 | 0 | 1,176 | 369 | 0
Dividends paid | (24,740) | 0 | 0 | 0 | (24,740)
Unrealized gain (loss) on marketable securities, net of tax | 63 | 0 | 0 | 0 | 63
Net income | 104,845 | 0 | 0 | 0 | 104,845
Balance at Jun. 30, 2019 | 134,889 | $ 555 | 41,009 | (383,830) | 477,155
Balance (shares) at Jun. 30, 2019 |  | 55,489 |  |  |
Balance at Mar. 31, 2019 | 119,194 | $ 555 | 33,833 | (376,097) | 460,903
Balance (shares) at Mar. 31, 2019 |  | 55,489 |  |  |
Purchase of treasury stock, at cost | (9,759) | $ 0 | 0 | (9,759) | 0
Stock-based compensation expense | 8,256 | 0 | 6,436 | 1,820 | 0
Other | 946 | 0 | 740 | 206 | 0
Dividends paid | (12,354) | 0 | 0 | 0 | (12,354)
Unrealized gain (loss) on marketable securities, net of tax | 50 | 0 | 0 | 0 | 50
Net income | 28,556 | 0 | 0 | 0 | 28,556
Balance at Jun. 30, 2019 | 134,889 | $ 555 | 41,009 | (383,830) | 477,155
Balance (shares) at Jun. 30, 2019 |  | 55,489 |  |  |
Balance at Dec. 31, 2019 | 4,079 | $ 555 | 48,141 | (544,102) | 499,485
Balance (shares) at Dec. 31, 2019 |  | 55,489 |  |  |
Purchase of treasury stock, at cost | (61,230) | $ 0 | 0 | (61,230) | 0
Issuance of long-term incentive awards and dividend equivalents | 0 | 0 | (7,088) | 7,898 | (810)
Stock-based compensation expense | 17,246 | 0 | 13,341 | 3,905 | 0
Other | 1,605 | 0 | 389 | 1,216 | 0
Dividends paid | (31,074) | 0 | 0 | 0 | (31,074)
Unrealized gain (loss) on marketable securities, net of tax | 69 | 0 | 0 | 0 | 69
Net income | 113,943 | 0 | 0 | 0 | 113,943
Balance at Jun. 30, 2020 | 44,638 | $ 555 | 54,783 | (592,313) | 581,613
Balance (shares) at Jun. 30, 2020 |  | 55,489 |  |  |
Balance at Mar. 31, 2020 | (3,310) | $ 555 | 46,327 | (595,487) | 545,295
Balance (shares) at Mar. 31, 2020 |  | 55,489 |  |  |
Purchase of treasury stock, at cost | (27) | $ 0 | 0 | (27) | 0
Stock-based compensation expense | 10,694 | 0 | 8,448 | 2,246 | 0
Other | 963 | 0 | 8 | 955 | 0
Dividends paid | (15,517) | 0 | 0 | 0 | (15,517)
Unrealized gain (loss) on marketable securities, net of tax | (16) | 0 | 0 | 0 | (16)
Net income | 51,851 | 0 | 0 | 0 | 51,851
Balance at Jun. 30, 2020 | $ 44,638 | $ 555 | $ 54,783 | $ (592,313) | $ 581,613
Balance (shares) at Jun. 30, 2020 |  | 55,489 |  |  |

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