Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Advertising Expense	$ 210,929	$ 178,068	$ 150,734
Foreign Currency Transaction Gain (Loss), Realized	(21,990)	(23,729)	$ 7,322
Accounts Receivable, Net, Noncurrent	$ 79,048	$ 54,552
Stockholders entitled election of Board of Directors	25.00%
Common Class A [Member]
Common Stock, Voting Rights	1
Common Stock, Conversion Basis	1
Common Class B [Member]
Common Stock, Voting Rights	10
Common Stock, Conversion Basis	1
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number of Customers	1	1
Concentration Risk, Percentage	17.00%	15.00%
Maximum [Member]
Deferred Carriage Fees Contractual Period	13 years
Restricted Stock Units (RSUs) [Member] | 2011 Non-Employee Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	100.00%