Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Cash paid for interest	$ 150	$ 65
Cash paid for federal and state income taxes	21	5
Non-cash transactions:
Change in accounts payable related to property and equipment additions	1,129	(683)
Property and equipment acquired under finance leases	$ 0	$ 556