CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 6,741	$ 4,872
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,692	3,906
Amortization of deferred loan costs	135	134
Stock-based compensation	1,115	962
(Recoveries) Provision for bad debts	(32)	48
Loss on disposition of assets		18
Changes in operating assets and liabilities:
Receivables	1,383	581
Income taxes receivable	1,736	2,720
Inventories	91	193
Prepaid expenses	99	374
Accounts payable	534	(1,224)
Accrued expenses	(2,467)	(2,274)
Net cash provided by operating activities	13,027	10,310
Cash flows from investing activities:
Proceeds from sale of assets		1
Change in construction payable	5,394	90
Acquisition of property and equipment	(18,204)	(12,246)
Net cash used in investing activities	(12,810)	(12,155)
Net increase (decrease) in cash	217	(1,845)
Cash and cash equivalents at beginning of period	29,151	26,383
Cash and cash equivalents at end of period	29,368	24,538
Supplemental disclosure of cash flow information
Cash paid for interest, net of amounts capitalized		$ 138
Adjustment to beginning retained earnings for accounting changes in accordance with the new revenue recognition standard
Accrued Expenses	$ 4,858