v3.6.0.2

Summary of significant accounting policies - Non controlling interests (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 04, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Aug. 03, 2015 | Dec. 31, 2009
Non-controlling interests |  |  |  |  |  |
Distributions to non-controlling interest holders |  | $ 286 | $ 500 | $ 623 |  |
Reduction to additional paid-in capital resulting from purchase of remaining noncontrolling interest |  |  | 1,150 |  |  |
Non-controlling owners capital account amount |  | $ 738 | 755 |  |  |
Concourse Communications Detroit, LLC |  |  |  |  |  |
Non-controlling interests |  |  |  |  |  |
Percentage of additional ownership in subsidiary acquired | 30.00% |  |  |  |  |
Total purchase price | $ 1,150 |  |  |  |  |
Reduction to additional paid-in capital resulting from purchase of remaining noncontrolling interest | $ 1,150 |  |  |  |  |
Concourse Communications Detroit, LLC |  |  |  |  |  |
Non-controlling interests |  |  |  |  |  |
Initial term of Detroit Operating Agreement |  | 7 years |  |  |  |
Optional extension period of Detroit Operating Agreement |  | 4 years |  |  |  |
Non-controlling owners capital account amount |  |  |  |  |  | $ 0
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 |  | $ 286 | 500 | 623 |  |
Percentage of ownership in subsidiaries |  | 70.00% |  |  |  |
Boingo Holding Participacoes Ltda. |  |  |  |  |  |
Non-controlling interests |  |  |  |  |  |
Distributions to non-controlling interest holders |  | $ 0 | $ 0 | $ 0 |  |
Percentage of ownership in subsidiaries |  | 75.00% |  |  |  |
Concourse Communications Detroit, LLC |  |  |  |  |  |
Non-controlling interests |  |  |  |  |  |
Percentage of ownership in subsidiaries |  |  |  |  | 70.00% |

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