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Property and equipment, net - Lease and maturity of lease liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Lease liabilities          
Lessee, Operating Lease, Existence of Residual Value Guarantee [true false]     false    
Lessee, Operating Lease, Existence of Option to Extend [true false]     true    
Operating lease liabilities, current $ 10,713   $ 10,713   $ 9,343
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accrued Liabilities, Current   Accrued Liabilities, Current   Accrued Liabilities, Current
Finance lease liabilities, current $ 1,978   $ 1,978   $ 664
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Finance lease liabilities, current   Finance lease liabilities, current   Finance lease liabilities, current
Operating lease liabilities, noncurrent $ 13,424   $ 13,424   $ 11,854
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other Liabilities, Noncurrent   Other Liabilities, Noncurrent   Other Liabilities, Noncurrent
Finance lease liabilities, noncurrent $ 32,848   $ 32,848   $ 31,918
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Finance lease liabilities, noncurrent   Finance lease liabilities, noncurrent   Finance lease liabilities, noncurrent
Total lease liabilities $ 58,963   $ 58,963   $ 53,779
Cash paid for operating lease liabilities     8,700 $ 8,600  
Cash paid for financing lease liabilities in financing cash flows     $ 619 626  
Maturity of our finance lease liabilities          
Weighted average lease term, finance leases 14 years 10 months 24 days   14 years 10 months 24 days    
Weighted average lease term, operating leases 4 years 10 months 24 days   4 years 10 months 24 days    
Weighted average discount rate, finance leases 3.60%   3.60%    
Weighted average discount rate, operating leases 4.50%   4.50%    
Expense related to our operating leases $ 2,900 $ 3,600 $ 9,000 10,900  
Amortization on our finance lease right-of-use assets 700 700 1,900 1,100  
Interest expense on finance lease liabilities $ 300 $ 300 $ 900 $ 300