CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net income	$ 8,418	$ 25,620
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,544	10,984
Amortization of deferred loan costs	466	403
Stock-based compensation	2,751	5,892
Provision for bad debts	75	44
Loss on disposition of assets	5
Write off of unamortized debt issuance costs	95
Changes in operating assets and liabilities:
Receivables	100	(67)
Income taxes	1,639	4,415
Inventories	(613)	(848)
Prepaid expenses	37	(80)
Right of use asset, net	(2)	10
Accounts payable	(5,755)	(33)
Accrued expenses	525	1,629
Net cash provided by operating activities	19,285	47,969
Cash flows from investing activities:
Proceeds from sale of assets	25
Change in construction payable	(6,135)	(4,348)
Acquisition of property and equipment	(30,237)	(106,345)
Net cash used in investing activities	(36,347)	(110,693)
Cash flows from financing activities:
Proceeds from exercise of stock options	1,161
Principal payments on long-term debt	(20,000)
Loan issuance cost	(2,862)
Long-term debt borrowings	8,750	61,350
Net cash (used in) provided by financing activities	(12,951)	61,350
Change in cash and cash equivalents	(30,013)	(1,374)
Cash and cash equivalents at beginning of period	60,539	30,462
Cash and cash equivalents at end of period	30,526	29,088
Supplemental disclosure of cash flow information:
Cash paid for income taxes		$ 1,842
Conversion of long term deposit to short term deposit	$ 908