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Acquisitions, Divestures and Exchanges 2 (Details) (USD $) | 12 Months Ended | 8 Months Ended
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Spectrum exchange | Dec. 31, 2011 Assets held for sale
Business acquisition, additional information |  |  |  |  |
Revenue | $ 4,343,346,000 | $ 4,177,681,000 | $ 4,213,880,000 |  | $ 20,700,000
Operating income | 280,780,000 | 201,473,000 | 325,525,000 |  | 14,800,000
Assets held for sale | 49,647,000 |  |  |  |
Liabilities held for sale | 1,051,000 |  |  |  |
Assets held for sale - Current assets | 4,200,000 |  |  |  |
Assets held for sale - Investments | 36,500,000 |  |  |  |
Assets held for sale - Property, plant and equipment | 8,900,000 |  |  |  |
Nonmonetary transactions |  |  |  |  |
Gain on asset exchange |  |  |  | $ 11,800,000 |
Asset exchange, valuation method |  |  |  | difference between the fair value of the licenses received, calculated using a market approach valuation method, and the carrying value of the licenses surrendered |
Agreement date |  |  |  | 9/30/2011 |

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