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Equity And Stock-Based Compensation (Schedule Of Stock Options Outstanding) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Equity And Stock-Based Compensation [Line Items] |  |  |
Weighted Average Exercise Price of Options Outstanding, Granted | $ 13.30 | $ 8.56 | $ 6.19
Weighted average remaining years of contractual life | 2 years 10 months 21 days | 2 years 4 months 24 days | 4 years 8 months 12 days
Weighted average remaining years of contractual life | 2 years 1 month 21 days | 3 years 7 months 17 days | 3 years 1 month 10 days
Aggregate Intrinsic Value, Exercised | $ 327,170 | $ 374,022 | $ 133,000
Aggregate Intrinsic Value, Ending balance | $ 2,188,011 | $ 4,197,000 | $ 938,503
Class A [Member] |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |
Common Stock Options Outstanding, Beginning balance | 568,250 | 709,850 | 672,350
Common Stock Options Outstanding, Granted | 112,000 | 80,000 | 175,000
Common Stock Options Outstanding, Exercised | (185,685) | (157,600) | (137,500)
Common Stock Options Outstanding, Expired | (8,000) | (64,000) |
Common Stock Options Outstanding, Ending balance | 486,565 | 568,250 | 709,850
Weighted Average Exercise Price of Options Outstanding, Beginning price | $ 6.88 | $ 6.66 | $ 6.24
Weighted Average Exercise Price of Options Outstanding, Granted | 13.30 | 8.56 | 6.19
Weighted Average Exercise Price of Options Outstanding, Exercised | 6.09 | 6.21 | 4.00
Weighted Average Exercise Price of Options Outstanding, Expired | 6.23 | 6.83 |
Weighted Average Exercise Price of Options Outstanding, Ending price | $ 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 | 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 | $ 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 Gross number of share options (or share units) granted during the period. + 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 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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- Definition Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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