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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common stock | Treasury stock | Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Balance (shares) at Dec. 31, 2018 |  | 476,095,000 | 53,410,000 |  |  |
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
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 262,763 |  |  |  |  | 262,763
Stock amortization and vesting (shares) |  | 682,000 |  |  |  |
Sale of stock held in rabbi trust | (213) | $ 68 |  | (281) |  |
Purchase of treasury stock (shares) |  |  | 0 |  |  |
Purchase of treasury stock | (28) |  | $ (28) |  |  |
Cash dividends | (29,605) |  |  |  |  | (29,605)
Other comprehensive loss | (137) |  |  |  | (137) |
Balance (shares) at Mar. 31, 2019 |  | 476,777,000 | 53,410,000 |  |  |
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 (shares) at Dec. 31, 2018 |  | 476,095,000 | 53,410,000 |  |  |
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
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 443,772 |  |  |  |  |
Balance (shares) at Jun. 30, 2019 |  | 476,879,000 | 58,491,000 |  |  |
Balance at end of period at Jun. 30, 2019 | 2,344,804 | $ 47,688 | $ (1,459,976) | 1,769,195 | 4,164 | 1,983,733
Balance (shares) at Mar. 31, 2019 |  | 476,777,000 | 53,410,000 |  |  |
Balance at beginning of period at Mar. 31, 2019 | 2,320,939 | $ 47,678 | $ (1,334,716) | 1,762,861 | 4,300 | 1,840,816
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 181,009 |  |  |  |  | 181,009
Stock amortization and vesting (shares) |  | 102,000 |  |  |  |
Sale of stock held in rabbi trust | 6,344 | $ 10 |  | 6,334 |  |
Purchase of treasury stock (shares) |  |  | 5,081,000 |  |  |
Purchase of treasury stock | (125,260) |  | $ (125,260) |  |  |
Cash dividends | (38,092) |  |  |  |  | (38,092)
Other comprehensive loss | (136) |  |  |  | (136) |
Balance (shares) at Jun. 30, 2019 |  | 476,879,000 | 58,491,000 |  |  |
Balance at end of period at Jun. 30, 2019 | 2,344,804 | $ 47,688 | $ (1,459,976) | 1,769,195 | 4,164 | 1,983,733
Balance (shares) at Dec. 31, 2019 |  | 476,882,000 | 78,957,000 |  |  |
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
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 53,910 |  |  |  |  | 53,910
Stock amortization and vesting (shares) |  | 651,000 |  |  |  |
Sale of stock held in rabbi trust | 2,951 | $ 65 |  | 2,886 |  |
Cash dividends | (39,817) |  |  |  |  | (39,817)
Other comprehensive loss | (136) |  |  |  | (136) |
Balance (shares) at Mar. 31, 2020 |  | 477,533,000 | 78,957,000 |  |  |
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 (shares) at Dec. 31, 2019 |  | 476,882,000 | 78,957,000 |  |  |
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
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 84,284 |  |  |  |  |
Balance (shares) at Jun. 30, 2020 |  | 477,535,000 | 78,957,000 |  |  |
Balance at end of period at Jun. 30, 2020 | 2,165,979 | $ 47,754 | $ (1,823,201) | 1,792,531 | 1,073 | 2,147,822
Balance (shares) at Mar. 31, 2020 |  | 477,533,000 | 78,957,000 |  |  |
Balance at beginning of period at Mar. 31, 2020 | 2,168,395 | $ 47,753 | $ (1,823,201) | 1,785,313 | 1,224 | 2,157,306
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 30,374 |  |  |  |  | 30,374
Stock amortization and vesting (shares) |  | 2,000 |  |  |  |
Sale of stock held in rabbi trust | 7,219 | $ 1 |  | 7,218 |  |
Cash dividends | (39,858) |  |  |  |  | (39,858)
Other comprehensive loss | (151) |  |  |  | (151) |
Balance (shares) at Jun. 30, 2020 |  | 477,535,000 | 78,957,000 |  |  |
Balance at end of period at Jun. 30, 2020 | $ 2,165,979 | $ 47,754 | $ (1,823,201) | $ 1,792,531 | $ 1,073 | $ 2,147,822

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