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Accounting Policies - Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 538,976 | $ 464,264 | $ 1,565,146 | $ 1,412,703
Advertising & Marketing Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 264,852 | 277,817 | 829,638 | 843,175
Subscription |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 207,463 | 177,692 | 622,382 | 540,344
Political |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 60,410 | 3,783 | 93,725 | 13,387
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 6,251 | $ 4,972 | $ 19,401 | $ 15,797

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