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Statements Of Changes In Shareholders' Equity (USD $) In Thousands, except Share data | Common Stock [Member] | Capital In Excess Of Par Value [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | ---
Balance at Dec. 31, 2008 | $ 5,593 | $ 89,028 | $ 463,508 | $ 558,129
Balance, shares at Dec. 31, 2008 | 55,927,000 |  |  |
Net income | 0 | 0 | 34,871 | 34,871
Balance at Dec. 31, 2009 | 5,593 | 89,028 | 498,379 | 593,000
Balance, shares at Dec. 31, 2009 | 55,927,000 |  |  |
Net income | 0 | 0 | 75,651 | 75,651
Purchase of fractional shares | 0 | (2) | 0 | (2)
Purchase of fractional shares, shares | 0 |  |  |
Balance at Dec. 31, 2010 | 5,593 | 89,026 | 574,030 | 668,649
Balance, shares at Dec. 31, 2010 | 55,927,000 |  |  | 55,926,945
Net income | 0 | 0 | 139,470 | 139,470
Issuance and sale of common stock | 151 | 48,249 | 0 | 48,400
Issuance and sale of common stock, shares | 1,516,000 |  |  |
Balance at Dec. 31, 2011 | $ 5,744 | $ 137,275 | $ 713,500 | $ 856,519
Balance, shares at Dec. 31, 2011 | 57,443,000 |  |  | 57,443,324

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