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Statements Of Changes In Shareholders' Equity (USD $) In Thousands, except Share data | Total | Common Stock [Member] | Retained Earnings [Member] | Capital In Excess Of Par Value [Member]
--- | --- | --- | --- | ---
Balance at Dec. 31, 2009 | $ 593,000 | $ 8,389 | $ 498,379 | $ 86,232
Balance, in shares at Dec. 31, 2009 |  | 83,891,000 |  |
Net income | 75,651 |  | 75,651 |
Adjustments to Additional Paid in Capital, Other | (2) |  |  | (2)
Balance at Dec. 31, 2010 | 668,649 | 8,389 | 574,030 | 86,230
Balance, in shares at Dec. 31, 2010 |  | 83,891,000 |  |
Net income | 139,470 |  | 139,470 |
Issuance and sale of common stock, shares |  | 2,274,000 |  |
Stock Issued During Period, Value, New Issues | 48,400 | 227 |  | 48,173
Balance at Dec. 31, 2011 | 856,519 | 8,616 | 713,500 | 134,403
Balance, in shares at Dec. 31, 2011 | 86,164,986 | 86,165,000 |  |
Net income | 169,452 |  | 169,452 |
Adjustments to Additional Paid in Capital, Other | (2) |  |  | (2)
Balance at Dec. 31, 2012 | $ 1,025,969 | $ 8,616 | $ 882,952 | $ 134,401
Balance, in shares at Dec. 31, 2012 | 86,164,917 | 86,165,000 |  |

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- Definition Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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