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Equity And Stock-Based Compensation (Schedule Of Stock Options Outstanding And Exercisable) (Details) - $ / shares | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |
Weighted Average Exercise Price of Options Outstanding, Granted |  |  |  |  | $ 13.30 | $ 7.40 |
Weighted average remaining contractual life of all options outstanding, vested, and expected to vest | 3 years 3 months 11 days |  | 3 years 2 months 23 days | 3 years 18 days |  |  | 2 years 5 months 9 days
Weighted average remaining contractual life of the exercisable options outstanding | 2 years 7 months 24 days |  | 2 years 4 months 28 days | 2 years 7 months 21 days |  |  | 3 years 1 month 10 days
Class A [Member] |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |
Common Stock Options Outstanding, Beginning balance | 538.00 |  | 532.00 | 568.00 | 568.00 |  |
Common Stock Options Outstanding, Granted |  |  | 100.00 | 12.00 |  |  |
Common Stock Options Outstanding, Exercised | (10.00) |  | (90.00) | (48.00) |  |  |
Common Stock Options Outstanding, Forfeited | (4.00) |  | (4.00) |  |  |  |
Common Stock Options Outstanding, Ending balance | 524.00 |  | 538.00 | 532.00 | 524.00 |  | 568.00
Weighted Average Exercise Price of Options Outstanding, Beginning price | $ 8.49 |  | $ 7.01 | $ 6.88 | $ 6.88 |  |
Weighted Average Exercise Price of Options Outstanding, Granted |  |  | 13.42 | 12.34 |  |  |
Weighted Average Exercise Price of Options Outstanding, Exercised | 8.35 |  | 5.29 | 6.87 |  |  |
Weighted Average Exercise Price of Options Outstanding, Forfeited | 6.23 |  | 6.23 |  |  |  |
Weighted Average Exercise Price of Options Outstanding, Ending price | $ 8.51 |  | $ 8.49 | $ 7.01 | $ 8.51 |  | $ 6.88
Common Stock Exercisable Options, Outstanding Beginning balance | 253.00 |  | 314.00 | 348.00 | 348.00 |  |
Common Stock Exercisable Options Outstanding, Granted | 13.00 |  | 31.00 | 13.00 |  |  |
Common Stock Exercisable Options Outstanding, Exercised | (10.00) |  | (89.00) | (47.00) |  |  |
Common Stock Exercisable Options Outstanding, Forfeited | (2.00) |  | (3.00) |  |  |  |
Common Stock Exercisable Options, Outstanding Ending balance | 254.00 |  | 253.00 | 314.00 | 254.00 |  | 348.00
Weighted Average Price of Exercisable Options, Outstanding Beginning balance | $ 7.56 |  | $ 7.02 | $ 6.82 | $ 6.82 |  |
Weighted Average Price of Exercisable Options, Outstanding Ending balance | $ 7.46 |  | $ 7.56 | $ 7.02 | $ 7.46 |  | $ 6.82
Class B [Member] |  |  |  |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |  |  |  |
Common Stock Options Outstanding, Beginning balance | 100.00 |  | 185.00 | 185.00 | 185.00 |  |
Common Stock Options Outstanding, Exercised | (100.00) |  | (85.00) |  |  |  |
Common Stock Options Outstanding, Ending balance |  |  | 100.00 | 185.00 |  |  | 185.00
Weighted Average Exercise Price of Options Outstanding, Beginning price | $ 10.24 |  | $ 9.90 | $ 9.90 | $ 9.90 |  |
Weighted Average Exercise Price of Options Outstanding, Exercised | $ 10.24 |  | 9.51 |  |  |  |
Weighted Average Exercise Price of Options Outstanding, Ending price |  |  | $ 10.24 | $ 9.90 |  |  | $ 9.90
Common Stock Exercisable Options, Outstanding Beginning balance | 100.00 |  | 185.00 | 185.00 | 185.00 |  |
Common Stock Exercisable Options Outstanding, Exercised | (100.00) | [1] | (85.00) |  |  |  |
Common Stock Exercisable Options, Outstanding Ending balance |  |  | 100.00 | 185.00 |  |  | 185.00
Weighted Average Price of Exercisable Options, Outstanding Beginning balance | $ 10.24 |  | $ 9.90 | $ 9.90 | $ 9.90 |  |
Weighted Average Price of Exercisable Options, Outstanding Ending balance |  |  | $ 10.24 | $ 9.90 |  |  | $ 9.90
[1] | The 100,000 Class B common stock options were exercised by a trust owned by the beneficial owners of the Company.

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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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