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Stock-Based Compensation and Stock Repurchases (Summary Of Vested Stock Options) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Equity And Stock-Based Compensation [Line Items] |  |  |
Weighted average remaining years of contractual life, Vested | 1 year 7 months 2 days | 2 years 1 month 21 days | 3 years 7 months 17 days
Aggregate intrinsic value, Vested | $ 2,584,500 | $ 1,401,321 | $ 2,476,230
Weighted average remaining years of contractual life, Nonvested | 3 years 10 months 13 days | 3 years 8 months 19 days | 4 years 3 months
Aggregate intrinsic value, Nonvested | $ 1,030,691 | $ 786,690 | $ 1,720,770
Class A [Member] |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |
Number of options, Vested | 296,500 | 256,065 | 348,000
Weighted average exercise price, Vested | $ 7.88 | $ 7.64 | $ 6.82
Number of options, Nonvested | 238,577 | 230,500 | 220,250
Weighted average exercise price, Nonvested | $ 12.28 | $ 9.83 | $ 6.98
Class B [Member] |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |
Number of options, Vested |  |  | 185,100
Weighted average exercise price, Vested |  |  | $ 9.90

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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 the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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