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Description of business, basis of presentation and summary of significant accounting policies - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | $ 2,299,497 | $ 2,207,282 | $ 1,903,026
Advertising & Marketing Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,226,607 | 1,106,754 | 1,139,642
Subscription |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,005,030 | 840,838 | 718,750
Political |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 38,478 | 233,613 | 23,258
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | $ 29,382 | $ 26,077 | $ 21,376

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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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