Leases - Future annual minimum lease payments and finance lease commitments (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Operating Leases
2019 (remaining three months)	$ 4,006
2020	14,359
2021	12,075
2022	10,339
2023	9,709
2024 and thereafter	54,454
Total minimum lease payments	104,942
Finance Lease, Liability, Payment, Due [Abstract]
2019 (remaining three months)	439
2020	1,781
2021	1,816
2022	1,853
2023	465
2024 and thereafter	0
Total minimum lease payments	$ 6,354