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Stock-Based Compensation And Stock Repurchases (Summary Of Stock Options Outstanding And Exercisable) (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Stock Options, Granted | 0 |  |
Class A [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of Stock Options, Beginning balance | 713,479 | 711,377 |
Number of Stock Options, Granted |  | 38,803 |
Number of Stock Options, Exercised | (38,803) |  |
Number of Stock Options, Forfeited | (157,332) | (36,701) |
Number of Stock Options Outstanding, Ending balance | 517,344 | 713,479 | 711,377
Weighted Average Exercise Price of Options Outstanding, Beginning price | $ 14.64 | $ 14.74 |
Weighted Average Exercise Price of Options Outstanding, Granted |  | 4.66 |
Weighted Average Exercise Price of Options Outstanding, Forfeited | 11.87 | 14.74 |
Weighted Average Exercise Price of Options Outstanding, Ending price | $ 15.35 | $ 14.64 | $ 14.74
Weighted Average Remaining Years of Contractual Life | 1 year 9 months 7 days | 2 years 2 months 4 days | 2 years 9 months 14 days
Aggregate Intrinsic Value, Beginning balance | $ 13,969 | $ 136,350 |
Aggregate Intrinsic Value, Ending balance |  | $ 13,969 | $ 136,350

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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