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Description of business, basis of presentation and summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [Abstract] |
Disaggregation of Revenue | Revenue earned by categories in 2019, 2018 and 2017 are shown below (amounts in thousands):
|  | Year ended Dec. 31,
|  | 2019 |  | 2018 |  | 2017
Advertising & Marketing Services |  | $ | 1,226,607 |  |  | $ | 1,106,754 |  |  | $ | 1,139,642 |
Subscription |  | 1,005,030 |  |  | 840,838 |  |  | 718,750 |
Political |  | 38,478 |  |  | 233,613 |  |  | 23,258 |
Other |  | 29,382 |  |  | 26,077 |  |  | 21,376 |
Total revenues |  | $ | 2,299,497 |  |  | $ | 2,207,282 |  |  | $ | 1,903,026 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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