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Statements Of Changes In Shareholders' Equity (USD $) In Thousands | Total | Common Stock [Member] | Retained Earnings [Member] | Capital In Excess Of Par Value [Member]
--- | --- | --- | --- | ---
Balance at Dec. 31, 2010 | $ 668,649 | $ 8,389 | $ 574,030 | $ 86,230
Balance, in shares at Dec. 31, 2010 |  | 83,891 |  |
Net income | 139,470 |  | 139,470 |
Issuance and sale of common stock, shares |  | 2,274 |  |
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 |  | 86,165 |  |
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 |  | 86,165 |  |
Net income | 206,113 |  | 206,113 |
Balance at Dec. 31, 2013 | $ 1,232,082 | $ 8,616 | $ 1,089,065 | $ 134,401

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