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Expected right-of-use asset and lease liability upon adoption of ASU 2018-11

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Number of Customers

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Class A stockholders are entitled to elect a percentage of the Board of Directors.

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Amount due from customers or clients, more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Description of basis for conversion of convertible common stock.

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Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Percentage of vesting of share-based compensation awards.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Summary of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares	Jan. 01, 2018 USD ($)
Accumulated earnings	$ 1,228,942	$ 766,725
Advertising Expense	196,000	200,400	$ 222,100
Foreign Currency Transaction Gain (Loss), before Tax	(6,800)	(15,000)	$ 39,000
Accounts Receivable, Net, Noncurrent	182,100	$ 150,200
Stock Repurchase Program, Authorized Amount	$ 1,500,000
Treasury Stock Acquired, Average Cost Per Share \| $ / shares	$ 52.56
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 559,400
Expected right-of-use asset and lease liability upon adoption of ASU 2018-11	$ 235,000
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Accumulated earnings				$ 12,800
Common Class A [Member]
Common Stock, Voting Rights	1
Common Stock, Conversion Basis	1
Stockholders entitled election of Board of Directors	25.00%
Share repurchases \| shares	5,400	7,790	4,120
Common Class B [Member]
Common Stock, Voting Rights	10
Common Stock, Conversion Basis	1
Share repurchases \| shares	0	0	0
Accounts Receivable [Member] \| Customer Concentration Risk [Member]
Number of Customers	2	1
Concentration Risk, Percentage		20.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Customer1 [Member]
Concentration Risk, Percentage	13.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Customer 2 [Member]
Concentration Risk, Percentage	12.00%
Maximum [Member]
Deferred Carriage Fees Contractual Period	10 years
2011 Non-Employee Director Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	100.00%