v3.6.0.2
Commitments and contingencies - Leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Capital and operating leases      
Rent expense for leases $ 27,140 $ 25,099 $ 29,434
Interest expense associated with the capital leases 158 58 33
Rent expense for leases of office facilities $ 2,993 2,995 1,621
Sublease income included in rent expenses   13 $ 27
Term of capital lease 3 years    
Capital Leases      
2017 $ 3,035    
2018 2,105    
2019 924    
2020 0    
2021 0    
Thereafter 0    
Minimum lease payments 6,064    
Less: Amounts representing interest ranging from 3.1% to 7.7% (243)    
Minimum lease payments 5,821    
Current portion 2,870 1,610  
Non-current portion 2,951 $ 2,217  
Operating Leases and Venue Guarantees      
2017 10,784    
2018 10,112    
2019 7,684    
2020 7,306    
2021 7,178    
Thereafter 23,382    
Minimum lease payments $ 66,446    
Minimum      
Operating Leases and Venue Guarantees      
Interest rate (as a percent) 3.10%    
Maximum      
Operating Leases and Venue Guarantees      
Initial term of operating leases 20 years    
Interest rate (as a percent) 7.70%