Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2018

Supplemental Cash Flow Elements [Abstract]

Schedule of supplemental cash flow information

Supplemental cash flows and non-cash transactions were as follows for the periods indicated (in thousands):

	Year Ended December 31,
	2018		2017		2016
Cash paid for interest	$	109	$	22	$	2
Cash paid for federal and state income taxes	787		459		2,589
Non-cash transactions:
Change in accounts payable related to property and equipment additions	1,685		70		679
Property and equipment acquired under capital leases	2,898		1,808		—