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Valuation And Qualifying Accounts (Summary Of Changes In Valuation And Qualifying Accounts) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |||||||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Allowance For Doubtful Accounts [Member]
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| Valuation and Qualifying Accounts Disclosure [Line Items] | ||||||||
| Balance of Beginning of Period | $ 6,930 | $ 11,453 | $ 9,682 | |||||
| Charges to Earnings | 4,095 | 360 | 3,846 | |||||
| Charges to Other Accounts | 120 | [1] | (108) | [1] | 348 | [1] | ||
| Deductions | (3,186) | (4,775) | (2,423) | |||||
| Balance at End of Period | 7,959 | 6,930 | 11,453 | |||||
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Other Reserves [Member]
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| Valuation and Qualifying Accounts Disclosure [Line Items] | ||||||||
| Balance of Beginning of Period | 7,797 | 6,599 | 5,842 | |||||
| Charges to Earnings | ||||||||
| Charges to Other Accounts | [1] | [1] | [1] | |||||
| Deductions | ||||||||
| Balance at End of Period | $ 11,114 | $ 7,797 | $ 6,599 | |||||
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