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Licenses and Goodwill (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Licenses
Balance, beginning of period	$ 1,452,101	$ 1,435,000
Acquisitions	4,406	17,101
Exchanges	11,842
Impairment			(14,000)
Other	2,420
Balance, end of period	1,470,769	1,452,101	1,435,000
Goodwill
Assigned value at time of acquisition	494,737	494,737
Balance, beginning of period	494,737	494,737
Balance, end of period	$ 494,737	$ 494,737	$ 494,737

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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