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Equity And Stock-Based Compensation (Schedule Of Stock Options Outstanding And Exercisable) (Details) (USD $) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Sep. 30, 2014 | Sep. 30, 2013
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |
Weighted Average Exercise Price of Options Outstanding, Granted |  |  |  | $ 7.40 | $ 5.89
Class A [Member] |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |
Common Stock Options Outstanding, Beginning balance | 652,350 | 729,350 | 709,850 | 709,850 |
Common Stock Options Outstanding, Granted |  |  | 20,000 | 20,000 | 50,000
Common Stock Options Outstanding, Exercised | (63,600) | (77,000) | (500) |  |
Common Stock Options Outstanding, Forfeited | (64,000) |  |  | (64,000) |
Common Stock Options Outstanding, Ending balance | 524,750 | 652,350 | 729,350 | 524,750 |
Weighted Average Exercise Price of Options Outstanding, Beginning price | $ 6.71 | $ 6.60 | $ 6.24 | $ 6.24 |
Weighted Average Exercise Price of Options Outstanding, Granted |  |  |  |  |
Weighted Average Exercise Price of Options Outstanding, Ending price | $ 6.60 | $ 6.71 | $ 6.60 | $ 6.60 |
Common Stock Exercisable Options, Outstanding Beginning balance | 435,350 | 510,350 | 490,350 | 490,350 |
Common Stock Exercisable Options, Outstanding Ending balance | 347,250 | 435,350 | 510,350 | 347,250 |
Weighted Average Price of Exercisable Options, Outstanding Beginning balance | $ 6.95 | $ 6.87 | $ 6.85 | $ 6.85 |
Weighted Average Price of Exercisable Options, Outstanding Ending balance | $ 6.78 | $ 6.95 | $ 6.87 | $ 6.78 |
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, Ending balance | 185,100 | 185,100 | 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, Granted |  |  |  |  |
Weighted Average Exercise Price of Options Outstanding, Ending price | $ 9.90 | $ 9.90 | $ 9.90 | $ 9.90 |
Common Stock Exercisable Options, Outstanding Beginning balance |  | 185,100 | 185,100 | 185,100 |
Common Stock Exercisable Options, Outstanding Ending balance | 185,100 | 185,100 | 185,100 | 185,100 |
Weighted Average Price of Exercisable Options, Outstanding Beginning balance |  | $ 9.90 | $ 9.90 | $ 9.90 |
Weighted Average Price of Exercisable Options, Outstanding Ending balance | $ 9.90 | $ 9.90 | $ 9.90 | $ 9.90 |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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)(1) -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 per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 3: 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 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 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 6: 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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