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Consolidated Balance Sheets (Parenthetical) (USD $) | Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011
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Stockholders' equity: |  |  |
Common stock shares authorized (in shares) | 500,000,000 | 500,000,000 | 500,000,000
Common stock par value (in dollars per share) | $ 1.00 | $ 1.00 | $ 1.00
Common stock shares issued (in shares) | 189,369,450 | 189,332,485 | 189,332,485
Treasury stock (in shares) | 538,921 | 538,921 | 538,921

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