Leases - Maturities of operating and financing lease liabilities (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Operating Leases
2019	$ 3,864
2020	6,484
2021	5,494
2022	4,707
2023	1,241
Thereafter	1,149
Total lease payments	22,939
Impact of discounting	(5,126)
Total operating lease liabilities	17,813
Finance Leases
2019	11,946
2020	20,771
2021	12,493
2022	5,160
2023	738
Thereafter	55
Total lease payments	$ 51,163