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Description Of Business And Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2007 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 27, 2015 | Apr. 16, 2013 | Aug. 15, 2007
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Convertible debenture, interest rate |  |  |  |  | 5.25% | 4.625% | 3.25%
Convertible debenture, maturity date | Aug. 15, 2037 |  |  |  |  |  |
Net remeasurement gain (loss) on foreign currency translation |  | $ 1,000,000 | $ 1,000,000 |  |  |  |
Gains (losses) on foreign currency forward contracts |  | 1,000,000 | 1,000,000 |  |  |  |
Advertising expenses |  | 17,200,000 | 16,000,000 | $ 20,200,000 |  |  |
Derivative, Notional Amount |  | 39,200,000 |  |  |  |  |
Deferred Tax Liabilities, Net, Noncurrent |  | $ 371,433,000 | $ 294,194,000 |  |  |  |
Building Improvements [Member] |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful life of property and equipment (years) |  | 10 years |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
RegistrationTerm |  | 10 years |  |  |  |  |
Average Service Term |  | 2 years |  |  |  |  |
Maximum [Member] | Buildings [Member] |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful life of property and equipment (years) |  | 47 years |  |  |  |  |
Maximum [Member] | Computer Equipment, Purchased Software, Office Equipment, And Furniture And Fixtures [Member] |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful life of property and equipment (years) |  | 5 years |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
RegistrationTerm |  | 1 year |  |  |  |  |
Average Service Term |  | 1 year |  |  |  |  |
Minimum [Member] | Buildings [Member] |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful life of property and equipment (years) |  | 35 years |  |  |  |  |
Minimum [Member] | Computer Equipment, Purchased Software, Office Equipment, And Furniture And Fixtures [Member] |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful life of property and equipment (years) |  | 3 years |  |  |  |  |

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