Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended			12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Postretirement Benefits [Member]	Dec. 31, 2013 Postretirement Benefits [Member]	Jun. 30, 2014 Proportionate Share of Telesat Other Comprehensive Loss [Member]	Dec. 31, 2013 Proportionate Share of Telesat Other Comprehensive Loss [Member]	Jun. 30, 2014 Accumulated Other Comprehensive Loss [Member]	Dec. 31, 2013 Accumulated Other Comprehensive Loss [Member]
Accumulated other comprehensive income (loss), beginning balance			$ (20,916)		$ (9,171)	$ (17,653)	$ (11,745)	$ (19,741)	$ (20,916)	$ (37,394)
Other comprehensive income (loss) before reclassification						3,102	920	7,996	920	11,098
Amounts reclassified from accumulated other comprehensive income (loss)					129	5,380			129	5,380
Net current-period other comprehensive income (loss)	286	491	1,049	1,863	129	8,482	920	7,996	1,049	16,478
Accumulated other comprehensive income (loss), ending balance	$ (19,867)		$ (19,867)		$ (9,042)	$ (9,171)	$ (10,825)	$ (11,745)	$ (19,867)	$ (20,916)