Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Licenses
Balance, beginning of period	$ 1,456,794	$ 1,470,769	$ 1,470,769
Acquisitions	14,150	12,647
Transferred to Assets held for sale	(74,765)
Other		786
Balance, end of period	1,396,179	1,484,202	1,456,794
Goodwill
Assigned value at time of acquisition			494,737	494,737
Balance, beginning of period	421,743	494,737	494,737
Transferred to Assets held for sale	(669)		(72,994)
NY1 & NY2 Deconsolidation	(33,714)
Balance, end of period	$ 387,360	$ 494,737	$ 421,743

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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