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Consolidated Statements of Shareholders' Equity Statement - USD ($) $ in Thousands | Total | Common Stock [Member] | Retained Earnings [Member] | Cumulative Effect, Period Of Adoption, Adjustment [Member] Retained Earnings [Member] | Cumulative Effect, Period Of Adoption, Adjusted Balance [Member] Retained Earnings [Member]
--- | --- | --- | --- | --- | ---
Shareholders' equity, beginning balance at Dec. 31, 2018 |  | $ 98,026 | $ 1,519,658 | $ 0 | $ 1,519,658
Proceeds from stock options exercised |  | 591 |  |  |
Share-based compensation expense |  | 88 |  |  |
Withholding tax on stock options exercised |  | (22) |  |  |
Net income | $ 288,399 |  | 288,399 |  |
Dividends paid to shareholders |  |  | (104,196) |  |
Shareholders' equity, ending balance at Sep. 30, 2019 | 1,802,544 | 98,683 | 1,703,861 |  |
Shareholders' equity, beginning balance at Jun. 30, 2019 |  | 98,647 | 1,669,315 | 0 | 1,669,315
Proceeds from stock options exercised |  | 0 |  |  |
Share-based compensation expense |  | 36 |  |  |
Withholding tax on stock options exercised |  | 0 |  |  |
Net income | 69,282 |  | 69,282 |  |
Dividends paid to shareholders |  |  | (34,736) |  |
Shareholders' equity, ending balance at Sep. 30, 2019 | 1,802,544 | 98,683 | 1,703,861 |  |
Shareholders' equity, beginning balance at Dec. 31, 2019 | 1,799,502 | 98,828 | 1,700,674 | (2,014) | 1,698,660
Proceeds from stock options exercised |  | 0 |  |  |
Share-based compensation expense |  | 106 |  |  |
Withholding tax on stock options exercised |  | 0 |  |  |
Net income | 207,864 |  | 207,864 |  |
Dividends paid to shareholders |  |  | (104,626) |  |
Shareholders' equity, ending balance at Sep. 30, 2020 | 1,900,832 | 98,934 | 1,801,898 |  |
Shareholders' equity, beginning balance at Jun. 30, 2020 |  | 98,898 | 1,717,917 | $ 0 | $ 1,717,917
Proceeds from stock options exercised |  | 0 |  |  |
Share-based compensation expense |  | 36 |  |  |
Withholding tax on stock options exercised |  | 0 |  |  |
Net income | 118,857 |  | 118,857 |  |
Dividends paid to shareholders |  |  | (34,876) |  |
Shareholders' equity, ending balance at Sep. 30, 2020 | $ 1,900,832 | $ 98,934 | $ 1,801,898 |  |

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