v3.20.4

Summary of significant accounting policies - Non controlling interests (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Non-controlling interests |  |  |
Distributions to non-controlling interest holders | $ 262 | $ 1,003 | $ 614
Chicago Concourse Development Group, LLC |  |  |
Non-controlling interests |  |  |
Percentage of net profits less capital expenditures of the preceding year allocated to non-controlling interest holders | 30.00% |  |
Distributions to non-controlling interest holders | $ 262 | 1,003 | 614
Boingo Holding Participacoes Ltda. |  |  |
Non-controlling interests |  |  |
Distributions to non-controlling interest holders | $ 0 | $ 0 | $ 0

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