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Consolidated Statements Of Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member]
--- | --- | --- | --- | ---
Beginning of year at Dec. 31, 2014 |  | $ 88,705 | $ 3,804 | $ 1,782,937
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Exercise of stock options |  | 2,111 | 0 |
Payment for vested restricted stock units and related taxes |  | 0 | 0 |
Reclassification of restricted stock units from equity to liability award |  | 0 | 0 |
Share-based compensation expense |  | 142 | 5,066 |
Excess tax benefits related to share-based compensation | $ 27 | 27 |  |
Net income | 74,479 |  |  |
Income available to common stockholders after assumed conversions, Diluted | 74,479 |  |  |
Dividends paid to shareholders |  |  |  | (136,386)
End of year at Dec. 31, 2015 | 1,820,885 | 90,985 | 8,870 | 1,721,030
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Exercise of stock options |  | 1,818 | 313 |
Payment for vested restricted stock units and related taxes |  | 1,671 | (5,122) |
Reclassification of restricted stock units from equity to liability award |  | 0 | (3,435) |
Share-based compensation expense |  | 142 | 0 |
Excess tax benefits related to share-based compensation | 913 | 913 |  |
Net income | 73,044 |  |  |
Income available to common stockholders after assumed conversions, Diluted | 73,044 |  |  |
Dividends paid to shareholders |  |  |  | (137,201)
End of year at Dec. 31, 2016 | 1,752,402 | 95,529 | 0 | 1,656,873
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Exercise of stock options |  | 2,102 | 0 |
Payment for vested restricted stock units and related taxes |  | 0 | 0 |
Reclassification of restricted stock units from equity to liability award |  | 168 | 0 |
Share-based compensation expense |  | 60 | 0 |
Excess tax benefits related to share-based compensation | (8) | 0 |  |
Net income | 144,877 |  |  |
Income available to common stockholders after assumed conversions, Diluted | 144,877 |  |  |
Dividends paid to shareholders |  |  |  | (137,886)
End of year at Dec. 31, 2017 | $ 1,761,387 | $ 97,523 | $ 0 | $ 1,663,864

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