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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Treasury Stock | Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2018 | $ 2,088,159 | $ 47,610 | $ (1,334,688) | $ 1,763,142 | $ 4,437 | $ 1,607,658
Balance (in shares) at Dec. 31, 2018 |  | 476,095 | 53,410 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 262,763 |  |  |  |  | 262,763
Stock amortization and vesting | (213) | $ 68 |  | (281) |  |
Stock amortization and vesting (in shares) |  | 682 |  |  |  |
Purchase of treasury stock | (28) |  | $ (28) |  |  |
Purchase of treasury stock (in shares) |  |  | 0 |  |  |
Cash dividends | (29,605) |  |  |  |  | (29,605)
Other comprehensive income (loss) | (137) |  |  |  | (137) |
Balance at end of period at Mar. 31, 2019 | 2,320,939 | $ 47,678 | $ (1,334,716) | 1,762,861 | 4,300 | 1,840,816
Balance (in shares) at Mar. 31, 2019 |  | 476,777 | 53,410 |  |  |
Balance at beginning of period at Dec. 31, 2019 | 2,151,487 | $ 47,688 | $ (1,823,201) | 1,782,427 | 1,360 | 2,143,213
Balance (in shares) at Dec. 31, 2019 |  | 476,882 | 78,957 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 53,910 |  |  |  |  | 53,910
Stock amortization and vesting | 2,951 | $ 65 |  | 2,886 |  |
Stock amortization and vesting (in shares) |  | 651 |  |  |  |
Cash dividends | (39,817) |  |  |  |  | (39,817)
Other comprehensive income (loss) | (136) |  |  |  | (136) |
Balance at end of period at Mar. 31, 2020 | $ 2,168,395 | $ 47,753 | $ (1,823,201) | $ 1,785,313 | $ 1,224 | $ 2,157,306
Balance (in shares) at Mar. 31, 2020 |  | 477,533 | 78,957 |  |  |

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