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Consolidated Statements Of Shareholders' Equity (USD $) In Thousands | Common Stock [Member] | Additional Paid In Capital [Member] | Accumulated Other Comprehensive Loss [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | ---
Beginning of year at Dec. 31, 2008 | $ 71,428 | $ 0 | $ (876) | $ 1,423,499 |
Proceeds of stock options exercised | 393 |  |  |  | 393
Share-based compensation expense | 763 | 0 |  |  | 763
Tax benefit on sales of incentive stock options | 5 |  |  |  | 5
Exercise of stock options |  | 0 |  |  |
Change in other comprehensive loss, net of tax |  |  | 279 |  |
Net income |  |  |  | 403,072 | 403,072
Dividends paid to shareholders |  |  |  | (127,617) | (127,617)
End of year at Dec. 31, 2009 | 72,589 | 0 | (597) | 1,698,954 | 1,770,946
Proceeds of stock options exercised | 816 |  |  |  | 733
Share-based compensation expense | 651 | 161 |  |  | 812
Tax benefit on sales of incentive stock options | 132 |  |  |  | 132
Exercise of stock options |  | (83) |  |  |
Change in other comprehensive loss, net of tax |  |  | (143) |  |
Net income |  |  |  | 152,198 | 152,198
Dividends paid to shareholders |  |  |  | (129,863) | (129,863)
End of year at Dec. 31, 2010 | 74,188 | 78 | (740) | 1,721,289 | 1,794,815
Proceeds of stock options exercised | 1,951 |  |  |  | 1,951
Share-based compensation expense | 439 | 460 |  |  | 899
Tax benefit on sales of incentive stock options | 56 |  |  |  | 56
Exercise of stock options |  | 0 |  |  |
Change in other comprehensive loss, net of tax |  |  | 740 |  |
Net income |  |  |  | 191,164 | 191,164
Dividends paid to shareholders |  |  |  | (132,142) | (132,142)
End of year at Dec. 31, 2011 | $ 76,634 | $ 538 | $ 0 | $ 1,780,311 | $ 1,857,483

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- Definition Reductions in the entity's income taxes that arise when compensation cost (from non-qualified equity-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. This element reduces net cash provided by operating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A96 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6576910&loc=d3e11374-113907 + Details
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