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Property and equipment, net - Lease and maturity of lease liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
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 $ 10,832   $ 10,832  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accrued Liabilities, Current   Accrued Liabilities, Current  
Finance lease liabilities, current $ 791   $ 791  
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Finance lease liabilities, current   Finance lease liabilities, current  
Operating lease liabilities, noncurrent $ 13,284   $ 13,284  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other Liabilities, Noncurrent   Other Liabilities, Noncurrent  
Finance lease liabilities, noncurrent $ 31,643   $ 31,643  
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Finance lease liabilities, noncurrent   Finance lease liabilities, noncurrent  
Total lease liabilities $ 56,550   $ 56,550  
Cash paid for operating lease liabilities     5,400  
Cash paid for financing lease liabilities in financing cash flows     409  
Maturity of our operating lease liabilities        
Remainder of 2019 6,771   6,771  
2020 7,901   7,901  
2021 5,121   5,121  
2022 2,831   2,831  
2023 1,588   1,588  
After 2023 1,346   1,346  
Total lease cash payments 25,558   25,558  
Less: discount 1,442   1,442  
Present value of lease liabilities 24,116   24,116  
Maturity of our finance lease liabilities        
Remainder of 2019 449   449  
2020 697   697  
2021 2,454   2,454  
2022 2,706   2,706  
2023 2,713   2,713  
After 2023 35,262   35,262  
Total lease cash payments 44,281   44,281  
Less: discount 11,847   11,847  
Present value of lease liabilities $ 32,434   $ 32,434  
Weighted average lease term, finance leases 16 years   16 years  
Weighted average lease term, operating leases 4 years 6 months   4 years 6 months  
Weighted average discount rate, operating leases 3.70%   3.70%  
Weighted average discount rate, finance leases 4.70%   4.70%  
Expense related to our operating leases $ 3,600   $ 7,300  
Amortization on our finance lease right-of-use assets $ 200   $ 400  
Rent expense   $ 3,700   $ 7,000