Investments In Affiliates (Equity In Net Income Of Affiliates) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Schedule of Equity Method Investments [Line Items]
Equity in net income of affiliates	$ 6,869	$ 46,246
Telesat Holdings Inc. [Member]
Schedule of Equity Method Investments [Line Items]
Equity in net income of affiliates	7,380	48,022
XTAR, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity in net income of affiliates	(511)	(1,764)
Other [Member]
Schedule of Equity Method Investments [Line Items]
Equity in net income of affiliates		$ (12)