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Supplemental Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quantifying Misstatement in Current Year Financial Statements [Line Items] |  |  |  |  |  |  |  |
Accrued media | $ 172,691,000 |  | $ 172,691,000 |  | $ 216,931,000 |  |  |
Asset Impairment Charges | 18,839,000 | $ 0 | 19,000,000 | $ 0 | 8,599,000 | $ 87,204,000 | $ 5,471,000 |
Impairment of Right-Of-Use Asset |  |  | 5,619,000 |  |  |  |  |
Goodwill | 706,946,000 |  | 706,946,000 |  | 731,691,000 | 732,752,000 |  |
Indefinite-lived intangible assets acquired |  |  | $ 14,600 |  |  |  |  |
Finite-lived intangible assets, remaining amortization period |  |  | 5 years |  |  |  |  |
Income tax expense (benefit) | (7,923,000) | 2,088,000 | $ 5,577,000 | 2,835,000 | 10,316,000 | 29,615,000 | (168,358,000) |
Income (loss) before income taxes and equity in earnings of non-consolidated affiliates | $ (4,617,000) | $ 9,215,000 | $ 10,677,000 | $ 10,195,000 | 20,867,000 | (88,669,000) | 86,022,000 |
Effective tax rate (percent) | 171600.00% | 22700.00% | 52200.00% | 27800.00% |  |  |  |
Revenues | $ 259,678,000 | $ 362,130,000 | $ 587,420,000 | $ 690,921,000 | 1,415,803,000 | 1,475,088,000 | 1,513,779,000 |
Increase (Decrease) in Accounts Receivable |  |  | $ (88,039,000) | $ 21,570,000 |  |  |  |
Restatement Adjustment |  |  |  |  |  |  |  |
Quantifying Misstatement in Current Year Financial Statements [Line Items] |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  | 780,000 | 7,147,000 | 1,056,000 |
Goodwill |  |  |  |  | (8,983,000) | (8,203,000) |  |
Income tax expense (benefit) |  |  |  |  | (217,000) | (1,988,000) | (294,000) |
Income (loss) before income taxes and equity in earnings of non-consolidated affiliates |  |  |  |  | (780,000) | (8,262,000) | (1,056,000) |
Increase (Decrease) in Deferred Income Tax Assets |  |  |  |  | 217,000 | 1,988,000 | 294,000 | $ 3,587,000
Revenues |  |  |  |  | 0 | (1,115,000) | 0 |
Goodwill, Period Increase (Decrease) |  |  |  |  | (780,000) | (7,147,000) | (1,056,000) |
Increase (Decrease) in Accounts Receivable |  |  |  |  |  | (1,115,000) |  |
Increase (Decrease) in Deferred Income Taxes |  |  |  |  | $ 217,000 | $ 1,988,000 | $ 294,000 | $ 3,587,000

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