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Summary of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Mar. 04, 2016 USD ($)
Advertising Expense | $ 222,067 | $ 210,929 | $ 178,068 |
Foreign Currency Transaction Gain (Loss), before Tax | 38,951 | 21,990 | $ 23,729 |
Accounts Receivable, Net, Noncurrent | $ 114,258 | $ 79,048 |  |
Stockholders entitled election of Board of Directors | 25.00% |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 500,000
Treasury Stock Acquired, Average Cost Per Share | $ / shares | $ 54.19 |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 276,763 |  |  |
Common Class A [Member] |  |  |  |
Common Stock, Voting Rights | 1 |  |  |
Common Stock, Conversion Basis | 1 |  |  |
Share repurchases | shares | (4,119,558) |  |  |
Common Class B [Member] |  |  |  |
Common Stock, Voting Rights | 10 |  |  |
Common Stock, Conversion Basis | 1 |  |  |
Share repurchases | shares | 0 |  |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |
Number of Customers | 1 | 1 |  |
Concentration Risk, Percentage | 19.00% | 17.00% |  |
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% |  |  |

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