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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, 2012 |  | $ 79,380 | $ 0 | $ 1,763,117
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Exercise of stock options |  | 1,884 | (438) |
Share-based compensation expense |  | 125 | 849 |
Tax benefit on sales of incentive stock options | $ 202 | 202 |  |
Net income | 112,143 |  |  | 112,143
Dividends paid to shareholders |  |  |  | (134,776)
End of year at Dec. 31, 2013 | 1,822,486 | 81,591 | 411 | 1,740,484
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Exercise of stock options |  | 6,824 | (577) |
Share-based compensation expense |  | 142 | 3,970 |
Tax benefit on sales of incentive stock options | 148 | 148 |  |
Net income | 177,949 |  |  | 177,949
Dividends paid to shareholders |  |  |  | (135,496)
End of year at Dec. 31, 2014 | 1,875,446 | 88,705 | 3,804 | 1,782,937
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Exercise of stock options |  | 2,111 | 0 |
Share-based compensation expense |  | 142 | 5,066 |
Tax benefit on sales of incentive stock options | 27 | 27 |  |
Net income | 74,479 |  |  | 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

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