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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Cumulative impact from accounting change | Common Shares | Treasury Stock | Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Retained Earnings Cumulative impact from accounting change
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2017 |  |  | 475,547,000 | 14,936,000 |  |  |  |
Balance at beginning of period at Dec. 31, 2017 | $ 2,523,905 | $ (446) | $ 47,555 | $ (430,576) | $ 1,742,419 | $ 2,077 | $ 1,162,430 | $ (446)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |
Net income | 557,043 |  |  |  |  |  | 557,043 |
Exercise of stock appreciation rights (in shares) |  |  | 9,000 |  |  |  |  |
Exercise of stock appreciation rights | 0 |  | $ 1 |  | (1) |  |  |
Stock amortization and vesting (in shares) |  |  | 539,000 |  |  |  |  |
Stock amortization and vesting | 20,778 |  | $ 54 |  | 20,724 |  |  |
Purchase of treasury stock (in shares) |  |  |  | 38,474,000 |  |  |  |
Purchase of treasury stock | (904,112) |  |  | $ (904,112) |  |  |  |
Cash dividends | (111,369) |  |  |  |  |  | (111,369) |
Other comprehensive income | 2,360 |  |  |  |  | 2,360 |  |
Balance (in shares) at Dec. 31, 2018 |  |  | 476,095,000 | 53,410,000 |  |  |  |
Balance at end 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 | 681,070 |  |  |  |  |  | 681,070 |
Stock amortization and vesting (in shares) |  |  | 787,000 |  |  |  |  |
Stock amortization and vesting | 19,363 |  | $ 78 |  | 19,285 |  |  |
Purchase of treasury stock (in shares) |  |  |  | 25,547,000 |  |  |  |
Purchase of treasury stock | (488,513) |  |  | $ (488,513) |  |  |  |
Cash dividends | (145,515) |  |  |  |  |  | (145,515) |
Other comprehensive income | (3,077) |  |  |  |  | (3,077) |  |
Balance (in shares) at Dec. 31, 2019 |  |  | 476,882,000 | 78,957,000 |  |  |  |
Balance at end 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 | 200,529 |  |  |  |  |  | 200,529 |
Stock amortization and vesting (in shares) |  |  | 947,000 |  |  |  |  |
Stock amortization and vesting | 22,022 |  | $ 95 |  | 21,927 |  |  |
Cash dividends | (159,390) |  |  |  |  |  | (159,390) |
Other comprehensive income | 1,059 |  |  |  |  | 1,059 |  |
Balance (in shares) at Dec. 31, 2020 |  |  | 477,829,000 | 78,957,000 |  |  |  |
Balance at end of period at Dec. 31, 2020 | $ 2,215,707 |  | $ 47,783 | $ (1,823,201) | $ 1,804,354 | $ 2,419 | $ 2,184,352 |

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