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Property and equipment, net - Lease and maturity of lease liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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	$ 9,343
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued Liabilities, Current
Finance lease liabilities, current	$ 664
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Finance lease liabilities, current
Operating lease liabilities, noncurrent	$ 11,854
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Liabilities, Noncurrent
Finance lease liabilities, noncurrent	$ 31,918
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Finance lease liabilities, noncurrent
Total lease liabilities	$ 53,779
Cash paid for operating lease liabilities	11,900
Cash paid for financing lease liabilities in financing cash flows	822
Maturity of our operating lease liabilities
2020	10,198
2021	6,015
2022	3,008
2023	1,594
2024	442
After 2024	962
Total lease cash payments	22,219
Less: discount	1,022
Present value of lease liabilities	21,197
Maturity of our finance lease liabilities
2020	728
2021	2,495
2022	2,746
2023	2,754
2024	2,750
After 2024	32,522
Total lease cash payments	43,995
Less: discount	11,413
Present value of lease liabilities	$ 32,582
Weighted average lease term, finance leases	15 years 9 months 18 days
Weighted average lease term, operating leases	3 years
Weighted average discount rate, operating leases	3.60%
Weighted average discount rate, finance leases	4.50%
Expense related to our operating leases	$ 12,800
Amortization on our finance lease right-of-use assets	1,700
Interest expense on finance lease liabilities	600
Cost of short term leases	1,100
Rent expenses for short term lease	1,000
Rent expense	$ 14,200
Rent Expense, before adoptiion of ASU 2016-02		$ 9,400	$ 8,200