CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income	$ 25,620	$ 26,839
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,984	11,081
Amortization of deferred loan costs	403	403
Stock-based compensation	5,892	4,197
Provisions for bad debts	44	27
Loss on disposition of assets		12
Changes in operating assets and liabilities:
Receivables	(67)	(35)
Income taxes	4,415	2,099
Inventories	(848)	11
Prepaid expenses	(80)	1
Right of use asset, net	10
Accounts payable	(33)	691
Accrued expenses	1,629	(335)
Net cash provided by operating activities	47,969	44,991
Cash flows from investing activities:
Change in construction payable	(4,348)	19,178
Acquisition of property and equipment	(106,345)	(101,696)
Net cash used in investing activities	(110,693)	(82,518)
Cash flows from financing activities:
Long-term debt borrowings	61,350	43,070
Net cash provided by financing activities	61,350	43,070
Change in cash and cash equivalents	(1,374)	5,543
Cash and cash equivalents at beginning of period	30,462	29,151
Cash and cash equivalents at end of period	29,088	34,694
Supplemental disclosure of cash flow information:
Cash paid for interest, net of amounts capitalized		186
Cash paid for income taxes	$ 1,842	4,650
Accrued expenses - adjustment to beginning retained earnings for accounting changes in accordance with the new revenue recognition standard		$ 4,858