Leases - Schedule of future minimum payments for operating and finance leases (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Operating Leases
2019	$ 8,179
2020	6,323
2021	5,438
2022	4,696
2023	1,248
Thereafter	1,215
Total lease payments	27,099
Finance Leases
2019	27,519
2020	19,322
2021	10,697
2022	3,233
2023	83
Thereafter	55
Total lease payments	$ 60,909