Leases - Annual future commitments under non-cancelable leases (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Lease Obligations, Operating Leases
Remainder of 2020	$ 4,452
2021	5,137
2022	4,829
2023	4,036
2024	2,516
Thereafter	2,957
Total minimum future obligations	23,927
Less interest	(2,874)
Present value of net future minimum obligations	21,053
Less current lease obligations	(4,770)	$ (4,619)
Long-term lease obligations	16,283	16,580
Lease Obligations, Finance Leases
Remainder of 2020	1,237
2021	1,411
2022	1,225
2023	1,196
2024	150
Thereafter	23
Total minimum future obligations	5,242
Less interest	(426)
Present value of net future minimum obligations	4,816
Less current lease obligations	(1,591)
Long-term lease obligations	$ 3,225	$ 3,331