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Stock-Based Compensation and Stock Repurchases (Schedule Of Stock Options Outstanding And Exercisable) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Equity And Stock-Based Compensation [Line Items] |  |  |  |
Weighted Average Exercise Price of Options Outstanding, Granted | $ 11.87 | $ 13.30 | $ 8.56 |
Weighted average remaining years of contractual life | 2 years 7 months 10 days | 2 years 10 months 21 days | 2 years 4 months 24 days | 4 years 8 months 12 days
Aggregate Intrinsic Value, Beginning balance | $ 2,188,011 | $ 4,197,000 | $ 938,503 |
Aggregate Intrinsic Value, Exercised | 220,002 | 327,170 | 374,022 |
Aggregate Intrinsic Value, Ending balance | $ 3,615,191 | $ 2,188,011 | $ 4,197,000 | $ 938,503
Class A [Member] |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |
Common Stock Options Outstanding, Beginning balance | 486,565 | 568,250 | 709,850 |
Common Stock Options Outstanding, Granted | 169,327 | 112,000 | 80,000 |
Common Stock Options Outstanding, Exercised | (46,815) | (185,685) | (157,600) |
Common Stock Options Outstanding, Expired | (74,000) | (8,000) | (64,000) |
Common Stock Options Outstanding, Ending balance | 535,077 | 486,565 | 568,250 | 709,850
Weighted Average Exercise Price of Options Outstanding, Beginning price | $ 8.68 | $ 6.88 | $ 6.66 |
Weighted Average Exercise Price of Options Outstanding, Granted | 11.87 | 13.30 | 8.56 |
Weighted Average Exercise Price of Options Outstanding, Exercised | 9.50 | 6.09 | 6.21 |
Weighted Average Exercise Price of Options Outstanding, Expired | 7.02 | 6.23 | 6.83 |
Weighted Average Exercise Price of Options Outstanding, Ending price | $ 9.84 | $ 8.68 | $ 6.88 | $ 6.66
Class B [Member] |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |
Common Stock Options Outstanding, Beginning balance |  | 185,100 | 185,100 |
Common Stock Options Outstanding, Granted |  |  |  |
Common Stock Options Outstanding, Exercised |  | (185,100) |  |
Common Stock Options Outstanding, Ending balance |  |  | 185,100 | 185,100
Weighted Average Exercise Price of Options Outstanding, Beginning price |  | $ 9.90 | $ 9.90 |
Weighted Average Exercise Price of Options Outstanding, Exercised |  | $ 9.90 |  |
Weighted Average Exercise Price of Options Outstanding, Ending price |  |  | $ 9.90 | $ 9.90

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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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 (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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