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Discontinued Operations - Narrative (Details) $ in Thousands |  |  | 6 Months Ended
--- | --- | --- | ---
Jul. 31, 2017 USD ($) | May 31, 2017 USD ($) market company | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Disposal Group Including Discontinued Operation, Shares of Spin-off Received by Shareholders, Conversion Ratio |  | 0.3333 |  |
Number of publicly traded companies after disposal | company |  | 2 |  |
Tax-free distribution |  |  | $ 20,133 | $ 0
Proceeds remaining, reserved for future repayments of debt |  |  | 40,000 |
Impairment of goodwill |  |  | 333,000 |
Cars.com |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Minimum notice period of termination of transition services |  | 45 days |  |
CareerBuilder |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Asset impairment and facility consolidation charges |  |  | 344,800 |
Asset impairment and facility consolidation charges attributable to parent |  |  | 273,500 |
Impairment of goodwill |  |  | 333,000 |
Estimated selling costs |  |  | 11,800 |
Tegna [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of markets In which entity operates | market |  | 25 |  |
Maximum | Cars.com |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Transition services agreement, period |  | 24 months |  |
Minimum | Cars.com |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Transition services agreement, period |  | 60 days |  |
Subsequent Event | CareerBuilder |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale of discontinued operation | $ 250,000 |  |  |
Ownership interest before sale (as a percent) | 53.00% |  |  |
Equity method investment retained after disposal, ownership interest (as a percent) | 17.00% |  |  |
Equity method investment retained after disposal, fully diluted ownership interest (as a percent) | 12.00% |  |  |
Revolving Credit Facility | Cars.com |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Tax-free distribution |  | $ 650,000 | $ 650,000 |

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