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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Common Stock [Member] Class A [Member] | Additional Paid-in Capital [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Loss [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2019 | $ 91 | $ 557,544 | $ (1,324,826) | $ (85,292) | $ 1,727,772 | $ 875,289
Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 0 | 0 | 0 | 0 | 19,730 | 19,730
Other comprehensive (loss) income, net of tax | 0 | 0 | 0 | (14,997) | 0 | (14,997)
Repurchase of Class A common stock (Note 6) | 0 | 0 | (60,886) | 0 | 0 | (60,886)
Exercise of employee stock options/vesting of stock awards | 0 | (3,083) | 1,676 | 0 | 0 | (1,407)
Stock-based compensation | 0 | 3,455 | 0 | 0 | 0 | 3,455
Cash dividends | 0 | 0 | 0 | 0 | (20,686) | (20,686)
Balance at end of period at Mar. 31, 2020 | 91 | 557,916 | (1,384,036) | (100,289) | 1,726,816 | 800,498
Balance at beginning of period at Dec. 31, 2020 | 91 | 579,801 | (1,461,593) | (64,768) | 1,840,740 | 894,271
Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 0 | 0 | 0 | 0 | 47,430 | 47,430
Other comprehensive (loss) income, net of tax | 0 | 0 | 0 | (6,858) | 0 | (6,858)
Repurchase of Class A common stock (Note 6) | 0 | 0 | (50,406) | 0 | 0 | (50,406)
Exercise of employee stock options/vesting of stock awards | 0 | (7,400) | 6,923 | 0 | 0 | (477)
Stock-based compensation | 0 | 6,803 | 0 | 0 | 0 | 6,803
Cash dividends | 0 | 0 | 0 | 0 | (19,289) | (19,289)
Balance at end of period at Mar. 31, 2021 | $ 91 | $ 579,204 | $ (1,505,076) | $ (71,626) | $ 1,868,881 | $ 871,474

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