Restructuring (Restructuring and Related Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 29,503	$ 14,998	$ 15,715
National Networks [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	8,516	3,194	3,664
International And Other [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 20,987	$ 11,804	$ 12,051