v3.10.0.1

Summary of significant accounting policies - Non controlling interests (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Non-controlling interests |  |  |
Distributions to non-controlling interest holders | $ 614 | $ 125 | $ 286
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 | $ 614 | 125 | 286
Boingo Holding Participacoes Ltda. |  |  |
Non-controlling interests |  |  |
Distributions to non-controlling interest holders | $ 0 | $ 0 | $ 0

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- Definition Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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