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Shared-Based Compensation And Share Repurchase Plans (Summary Of Vested And Unvested Stock Options) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Equity And Stock-Based Compensation [Line Items] |  |  |
Weighted average remaining years of contractual life, Vested | 2 years 3 months 11 days | 2 years 3 months 18 days | 1 year 7 months 2 days
Aggregate intrinsic value, Vested | $ 1,306,643 | $ 2,202,772 | $ 2,584,500
Weighted average remaining years of contractual life, Nonvested | 3 years 3 months 7 days | 3 years 7 months 13 days | 3 years 10 months 13 days
Aggregate intrinsic value, Nonvested | $ 223,885 | $ 851,552 | $ 1,030,691
Class A [Member] |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |
Vested | 231,124 | 186,832 | 296,500
Weighted average exercise price, Vested | $ 12.38 | $ 9.84 | $ 7.88
Unvested | 355,345 | 337,757 | 238,577
Weighted average exercise price, Nonvested | $ 15.07 | $ 13.86 | $ 12.28

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- Definition Share-based Compensation Arrangement By Share-based Payment Award, Options, Nonvested, Outstanding, Weighted Average Remaining Contractual Term + References No definition available. + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. 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) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. 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)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. 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)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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