Lease Obligations - Schedule of future minimum lease payments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Finance Lease Obligations
Remainder of 2019	$ 889
2020	1,185
2021	410
2022	0
2023	0
Thereafter	0
Total minimum lease payments	2,484
Financing component	(82)
Net present of minimum lease payments	2,402
Less: Current portion of financing and operating lease obligations	(1,127)	$ (1,119)
Long-term financing and operating lease obligations	1,275	1,514
Operating Lease Obligations
Remainder of 2019	4,693
2020	4,859
2021	3,752
2022	2,822
2023	1,533
Thereafter	2,481
Total minimum lease payments	20,140
Financing component	(4,139)
Net present value of minimum lease payments	16,001
Less: Current portion of financing and operating lease obligations	(4,401)	0
Long-term financing and operating lease obligations	11,600	$ 0
Total Lease Obligations
Remainder of 2019	5,582
2020	6,044
2021	4,162
2022	2,822
2023	1,533
Thereafter	2,481
Total minimum lease payments	22,624
Financing component	(4,221)
Net present value of minimum lease payments	18,403
Less: Current portion of financing and operating lease obligations	(5,528)
Long-term financing and operating lease obligations	$ 12,875