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Accounting Policies - Narrative (Details) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) market station | Mar. 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) segment market station | Sep. 30, 2017 USD ($) | Jan. 01, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Operating segments | segment |  |  |  | 1 |  |  |  |
Reportable segments | segment |  |  |  | 1 |  |  |  |
Number of television stations | station | 47 |  |  | 47 |  |  |  |
Number of markets In which entity operates | market | 39 |  |  | 39 |  |  |  |
Cumulative effect of new accounting principle in period of adoption, decrease in retained earnings | $ 3,724,000 |  |  | $ 3,724,000 |  |  |  |
Revenues | 538,976,000 |  | $ 464,264,000 | 1,565,146,000 | $ 1,412,703,000 |  |  |
Net cash provided by (used in) operating activities |  |  |  | 332,660,000 | 351,739,000 |  |  |
Net cash provided by (used in) investing activities |  |  |  | (352,407,000) | 153,366,000 |  |  |
Tax cuts and jobs act, reclassification from aoci to retained earnings, tax effect |  | $ 24,800,000 |  |  |  |  |  |
Restricted cash | 0 |  | $ 29,600,000 | $ 0 | 29,600,000 |  | $ 29,200,000 | $ 28,200,000
Accounting Standards Update 2014-09 | Retained Earnings |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption, decrease in retained earnings |  |  |  |  |  | $ 3,700,000 |  |
Accounting Standards Update 2016-15 |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Net cash provided by (used in) operating activities |  |  |  |  | (900,000) |  |  |
Net cash provided by (used in) investing activities |  |  |  |  | $ 900,000 |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Estimated effect due to new accounting standard adoption, percentage |  |  |  | 5.00% |  |  |  |
Barter Arrangement, Syndicated Programming | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 500,000 |  |  | $ 1,500,000 |  |  |  |
Minimum |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Revenue, performance obligation, description of timing |  |  |  | P60D |  |  |  |
Maximum |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Revenue, performance obligation, description of timing |  |  |  | P90D |  |  |  |

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