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Description Of Business And Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 31, 2007 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 01, 2017 | Aug. 15, 2007
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Capitalized Computer Software, Additions |  | $ 17,700 | $ 18,000 |  |  |
Convertible debenture, interest rate |  |  |  |  |  | 3.25%
Convertible debenture, maturity date | Aug. 15, 2037 |  |  |  |  |
Net remeasurement gain (loss) on foreign currency translation |  | 1,000 | 1,000 |  |  |
Gains (losses) on foreign currency forward contracts |  | 1,000 | 1,000 |  |  |
Advertising expenses |  | 27,400 | 17,200 | $ 16,000 |  |
Derivative, Notional Amount |  | 29,700 |  |  |  |
Deferred Tax Liabilities, Net, Noncurrent |  | 444,108 | 371,433 |  |  |
Deferred Tax Liabilities, Other |  | 3,116 | 2,614 |  |  |
Deferred Tax Asset for previously unrecognized excess tax benefits |  | 35,400 |  |  |  |
excess tax benefit related to stock based compensation |  |  | $ 25,100 | $ 18,500 |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  | $ 27,300 |  |  |  |
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 |  |  |  |
Deferred Tax Asset [Domain] |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | $ 11,000 |
Additional Paid-in Capital [Member] |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | 2,544 |
Retained Earnings [Member] |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | 32,916 |
Long-term deferred tax liability [member] |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  | $ 24,400 |

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