Leases - Annual future commitments under non-cancelable leases (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Lease Obligations, Operating Leases
Remainder of 2020	$ 2,983
2021	5,232
2022	4,926
2023	4,134
2024	2,609
Thereafter	2,998
Total minimum future obligations	22,882
Less interest	(2,613)
Present value of net future minimum obligations	20,269
Less current lease obligations	(4,717)	$ (4,619)
Long-term lease obligations	15,552	16,580
Lease Obligations, Finance Leases
Remainder of 2020	815
2021	1,412
2022	1,222
2023	1,196
2024	150
Thereafter	21
Total minimum future obligations	4,816
Less interest	(370)
Present value of net future minimum obligations	4,446
Less current lease obligations	(1,606)
Long-term lease obligations	$ 2,840	$ 3,331