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Equity-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 09, 2008 | Feb. 05, 2003 | Feb. 11, 1998 | Oct. 03, 2015 | Jan. 07, 2015
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Shares authorized for the issuance | 4,000,000 | 1,350,000 | 2,025,000 |  | 2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award | 10 | 10 | 10 |  |
Class A Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Closing price of common stock |  |  |  | $ 54.51 |
Employee Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Unvested compensation expense |  |  |  | $ 40 |
Unvested compensation expense weighted-average period of recognition, in years |  |  |  | 1 year |
Stock Appreciation Rights (SARs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Unvested compensation expense |  |  |  | $ 2,080 |
Unvested compensation expense weighted-average period of recognition, in years |  |  |  | 2 years |
Share-based Compensation Award, SARS, Outside Directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Stock option vesting period |  |  |  | 3 years |
Share-based Compensation Award, Options, Key Employees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Stock option vesting period |  |  |  | 5 years |
Share-based Compensation Award, SARS, Officers & Key Employees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Stock option vesting period |  |  |  | 1 year |

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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements. + 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 (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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