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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified |
Jun. 30, 2012
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Dec. 31, 2011
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Jun. 30, 2011
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|---|---|---|---|
| Accounts receivable, allowance for doubtful accounts | $ 49,653 | $ 54,010 | $ 47,918 |
| Common stock, stated value | $ 1 | $ 1 | $ 1 |
| Common stock, shares authorized | 300,000,000 | 300,000,000 | 300,000,000 |
| Common stock, shares outstanding | 109,438,153 | 110,556,981 | 109,597,701 |
| X | ||||||||||
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- Definition
A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Face amount or stated value of common stock per share; generally not indicative of the fair market value per share. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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