Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Licenses
Balance, beginning of period	$ 1,456,794	$ 1,470,769	$ 1,470,769
Acquisitions	16,540	57,957
Transferred to Assets held for sale	(75,446)
Other		3,147
Balance, end of period	1,397,888	1,531,873	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