Goodwill and Other Intangible Assets (Schedule Of Goodwill) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Goodwill [Line Items]
December 31, 2014	$ 734,356
Additions and purchase accounting adjustments	30,534
Amortization of second component goodwill	(2,524)
Foreign currency translation	(26,091)
December 31, 2015	736,275
National Networks [Member]
Goodwill [Line Items]
December 31, 2014	250,595
Additions and purchase accounting adjustments	(3,222)
Amortization of second component goodwill	(2,524)
Foreign currency translation	0
December 31, 2015	244,849
International And Other [Member]
Goodwill [Line Items]
December 31, 2014	483,761
Additions and purchase accounting adjustments	33,756
Amortization of second component goodwill	0
Foreign currency translation	(26,091)
December 31, 2015	$ 491,426