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Consolidated Statements Of Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Retained Earnings [Member]
--- | --- | --- | ---
Beginning of year at Dec. 31, 2016 |  | $ 95,529 | $ 1,656,873
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Proceeds of stock options exercised |  | 2,102 |
Reclassification of restricted stock units from equity to liability award |  | (168) |
Share-based compensation expense |  | 60 |
Withholding tax on stock options exercised |  | 0 |
Net income (loss) | $ 144,877 |  | 144,877
Dividends paid to shareholders |  |  | (137,886)
End of year at Dec. 31, 2017 | 1,761,387 | 97,523 | 1,663,864
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Proceeds of stock options exercised |  | 358 |
Reclassification of restricted stock units from equity to liability award |  | 0 |
Share-based compensation expense |  | 145 |
Withholding tax on stock options exercised |  | 0 |
Net income (loss) | (5,728) |  | (5,728)
Dividends paid to shareholders |  |  | (138,478)
End of year at Dec. 31, 2018 | 1,617,684 | 98,026 | 1,519,658
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Proceeds of stock options exercised |  | 701 |
Reclassification of restricted stock units from equity to liability award |  | 0 |
Share-based compensation expense |  | 123 |
Withholding tax on stock options exercised |  | (22) |
Net income (loss) | 320,087 |  | 320,087
Dividends paid to shareholders |  |  | (139,071)
End of year at Dec. 31, 2019 | $ 1,799,502 | $ 98,828 | $ 1,700,674

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