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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Capitalized Computer Software, Additions | $ 12,800 | $ 11,900 |
Advertising expenses | 7,500 | $ 12,800 | $ 15,200
Derivative, Notional Amount | $ 27,500 |  |
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 | ten |  |
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 | one |  |
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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition Additions made to capitalized computer software costs during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details
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