Arrangements with Joint Venture - Noncontrolling Interest (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Change in Value of Noncontrolling Interest [Roll Forward]
Purchases of membership units of non-controlling interests	$ 0	$ (5,250)
STX Wireless Acquisition [Member]
Change in Value of Noncontrolling Interest [Roll Forward]
Beginning balance	64,517	95,910
Accretion of redeemable non-controlling interests, before tax	(31,970)	(28)
Loans made to joint venture partner	(6,716)	(8,255)
Optional distributions made to joint venture partner	(18,338)	(16,243)
Other	2,898	1,673
Ending balance	$ 68,535	$ 64,517