v3.3.1.900
Commitments and contingencies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Commitments and contingencies      
Rent expense for leases $ 25,099 $ 29,434 $ 20,234
Interest expense associated with the capital leases 58 33 15
Rent expense for leases of office facilities 2,995 1,621 1,227
Sublease income included in rent expenses $ 13 27 $ 54
Term of capital lease 3 years    
Capital Leases      
2016 $ 1,610    
2017 1,686    
2018 554    
2019 0    
2020 0    
Thereafter 0    
Minimum lease payments 3,850    
Less: Amounts representing interest ranging from 2.4% to 7.7% (23)    
Capital leases minimum lease payments 3,827    
Current portion 1,610 309  
Non-current portion 2,217 $ 381  
Operating Leases and Venue Guarantees      
2016 11,536    
2017 10,431    
2018 9,567    
2019 7,273    
2020 6,961    
Thereafter 29,777    
Minimum lease payments $ 75,545    
Minimum      
Capital and operating leases      
Interest rate (as a percent) 2.40%    
Maximum      
Capital and operating leases      
Initial term of operating leases 20 years    
Interest rate (as a percent) 7.70%