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Description Of Business And Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
adjustments to current assets | $ 19,700 |  |
adjustments to non current assets | 7,600 |  |
adjustments to accumulated deficit | 22,500 |  |
Capitalized Computer Software, Additions | 14,700 | $ 17,700 |
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 | 15,200 | 27,400 | $ 17,200
Derivative, Notional Amount | 28,500 |  |
Deferred Tax Liabilities, Net, Noncurrent | 134 | 444,108 |
Deferred Tax Liabilities, Other | 5,352 | 3,116 |
adjustments to deferred tax liability | $ 4,800 |  |
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] |  |  |
Registration Payment Arrangement, Term | one |  |
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 |  |
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 |  | $ 22,512 | $ 32,916

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