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Long-Term Debt - Narrative (Details) $ in Thousands |  |  | 6 Months Ended
--- | --- | --- | ---
Aug. 01, 2017 | May 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |
Tax-free distribution |  |  | $ 20,133 | $ 0
Proceeds remaining, reserved for future repayments of debt |  |  | 40,000 |
Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of revolving credit agreement |  |  | 609,900 |
Remaining borrowing capacity |  |  | 1,500,000 |
Revolving Credit Facility | Cars.com |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from borrowings on revolving credit facility |  |  | 675,000 |
Tax-free distribution |  | $ 650,000 | $ 650,000 |
Covenant through June 30, 2018 | Subsequent Event | Amended and Restated Competitive Advance and Revolving Credit Agreement |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Covenant requirement, maximum total leverage ratio | 5.0 |  |  |
Covenant through June 30, 2019 | Subsequent Event | Amended and Restated Competitive Advance and Revolving Credit Agreement |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Covenant requirement, maximum total leverage ratio | 4.75 |  |  |
Covenant through June 29, 2020 | Subsequent Event | Amended and Restated Competitive Advance and Revolving Credit Agreement |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Covenant requirement, maximum total leverage ratio | 4.5 |  |  |

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