Goodwill and intangible assets - Carrying Amount (Details) - USD ($) $ in Thousands |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|---|
| Intangible assets | |||
| Historical Cost | $ 33,012 | $ 36,413 | |
| Accumulated Amortization | (22,360) | (21,473) | |
| Net | 10,652 | 14,940 | $ 19,152 |
| Venue contracts | |||
| Intangible assets | |||
| Historical Cost | 19,710 | 20,431 | |
| Accumulated Amortization | (16,030) | (15,247) | |
| Net | 3,680 | 5,184 | |
| Backlog | |||
| Intangible assets | |||
| Historical Cost | 7,388 | 7,388 | |
| Accumulated Amortization | (3,578) | (2,104) | |
| Net | 3,810 | 5,284 | |
| Customer and partner relationships | |||
| Intangible assets | |||
| Historical Cost | 3,780 | 3,780 | |
| Accumulated Amortization | (962) | (584) | |
| Net | 2,818 | 3,196 | |
| Non-compete agreements, technology and other | |||
| Intangible assets | |||
| Historical Cost | 2,134 | 4,814 | |
| Accumulated Amortization | (1,790) | (3,538) | |
| Net | $ 344 | $ 1,276 |