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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, 2013 |  | $ 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 |
Payment for vested restricted stock units and related taxes |  | 0 | 0 |
Reclassification of restricted stock units from equity to liability award |  |  | 0 |
Excess tax benefits related to share-based compensation | $ 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 |
Payment for vested restricted stock units and related taxes |  | 0 | 0 |
Reclassification of restricted stock units from equity to liability award |  |  | 0 |
Excess tax benefits related to share-based compensation | 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
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Exercise of stock options |  | 1,818 | 313 |
Share-based compensation expense |  | 142 | 0 |
Payment for vested restricted stock units and related taxes |  | 1,671 | (5,122) |
Reclassification of restricted stock units from equity to liability award |  |  | (3,435) |
Excess tax benefits related to share-based compensation | 913 | 913 |  |
Net income | 73,044 |  |  | 73,044
Dividends paid to shareholders |  |  |  | (137,201)
End of year at Dec. 31, 2016 | $ 1,752,402 | $ 95,529 | $ 0 | $ 1,656,873

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- Definition This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66904339&loc=d3e4534-113899 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11149-113907 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11178-113907 + Details
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