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Equity And Stock-Based Compensation (Schedule Of Stock Options Outstanding And Exercisable) (Details) - $ / shares shares in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Equity And Stock-Based Compensation [Line Items] |  |  |  |
Weighted Average Exercise Price of Options Outstanding, Granted | $ 11.87 | $ 13.30 |  |
Weighted average remaining years of contractual life | 2 years 9 months 29 days |  | 2 years 10 months 21 days | 2 years 4 months 24 days
Weighted average remaining contractual life of the exercisable options outstanding | 1 year 10 months 21 days |  | 2 years 1 month 21 days | 3 years 7 months 17 days
Class A [Member] |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |
Common Stock Options Outstanding, Beginning balance | 487 | 568 | 568 |
Common Stock Options Outstanding, Granted | 169 |  | 112 |
Common Stock Options Outstanding, Exercised |  |  | (185) |
Common Stock Options Outstanding, Forfeited | (74) |  | (8) |
Common Stock Options Outstanding, Ending balance | 582 |  | 487 | 568
Weighted Average Exercise Price of Options Outstanding, Beginning price | $ 7.64 | $ 6.88 | $ 6.88 |
Weighted Average Exercise Price of Options Outstanding, Granted | 11.87 |  | 13.30 |
Weighted Average Exercise Price of Options Outstanding, Exercised |  |  | 6.09 |
Weighted Average Exercise Price of Options Outstanding, Forfeited | 7.02 |  | 6.23 |
Weighted Average Exercise Price of Options Outstanding, Ending price | $ 9.82 |  | $ 7.64 | $ 6.88
Common Stock Exercisable Options, Outstanding Beginning balance | 256 | 348 | 348 |
Common Stock Exercisable Options Outstanding, Granted | 75 |  | 101 |
Common Stock Exercisable Options Outstanding, Exercised |  |  | (185) |
Common Stock Exercisable Options Outstanding, Forfeited | (29) |  | (8) |
Common Stock Exercisable Options, Outstanding Ending balance | 302 |  | 256 | 348
Weighted Average Price of Exercisable Options, Outstanding Beginning balance | $ 7.64 | $ 6.82 | $ 6.82 |
Weighted Average Price of Exercisable Options, Outstanding Ending balance | $ 8.18 |  | $ 7.64 | $ 6.82
Class B [Member] |  |  |  |
Equity And Stock-Based Compensation [Line Items] |  |  |  |
Common Stock Options Outstanding, Beginning balance |  | 185 | 185 |
Common Stock Options Outstanding, Granted |  |  |  |
Common Stock Options Outstanding, Exercised |  |  | (185) |
Common Stock Options Outstanding, Forfeited |  |  |  |
Common Stock Options Outstanding, Ending balance |  |  |  | 185
Weighted Average Exercise Price of Options Outstanding, Beginning price |  | $ 9.90 | $ 9.90 |
Weighted Average Exercise Price of Options Outstanding, Granted |  |  |  |
Weighted Average Exercise Price of Options Outstanding, Exercised |  |  | 9.90 |
Weighted Average Exercise Price of Options Outstanding, Forfeited |  |  |  |
Weighted Average Exercise Price of Options Outstanding, Ending price |  |  |  | $ 9.90
Common Stock Exercisable Options, Outstanding Beginning balance |  | 185 | 185 |
Common Stock Exercisable Options Outstanding, Granted |  |  |  |
Common Stock Exercisable Options Outstanding, Exercised |  |  | (185) |
Common Stock Exercisable Options Outstanding, Forfeited |  |  |  |
Common Stock Exercisable Options, Outstanding Ending balance |  |  |  | 185
Weighted Average Price of Exercisable Options, Outstanding Beginning balance |  | $ 9.90 | $ 9.90 |
Weighted Average Price of Exercisable Options, Outstanding Ending balance |  |  |  | $ 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 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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