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Summary of significant accounting policies - Contract Balances (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Change in Contract with Customer, Liability [Abstract] |  |  |  |
Balance, beginning of the period | $ 157,738 | $ 117,919 | $ 140,710 | $ 100,662
Revenue earned | (50,038) | (39,261) | (147,324) | (116,145)
Deferral of revenue | 80,538 | 54,651 | 194,852 | 148,792
Balance, end of the period | $ 188,238 | $ 133,309 | $ 188,238 | $ 133,309

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- Definition The amount of revenue deferred during the period in calculation of contract with customer liability. + References No definition available. + Details
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- Definition mount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due, and from current period increase in contract liability. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 + Details
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