Leases - Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Operating Leases
2019 (excluding the three months ended March 31, 2019)	$ 5,022
2020	5,614
2021	4,298
2022	2,823
2023	2,268
Thereafter	6,011
Total future minimum lease payments	26,036
Less - amount representing interest	3,332
Present value of future minimum lease payments	22,704
Less - current lease obligations	5,595	$ 0
Long-term lease obligations	17,109	0
Finance Leases
2019 (excluding the three months ended March 31, 2019)	2,783
2020	2,876
2021	2,521
2022	0
2023	0
Thereafter	0
Total future minimum lease payments	8,180
Less - amount representing interest	443
Present value of future minimum lease payments	7,737
Less - current lease obligations	2,875	0
Long-term lease obligations	$ 4,862	$ 0