CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 15,980	$ 12,111
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,430	7,675
Amortization of deferred loan costs	269	269
Stock-based compensation	3,012	2,163
(Recoveries) Provision for bad debts	(19)	37
Loss on disposition of assets	4	4
Changes in operating assets and liabilities:
Receivables	1,941	928
Income taxes receivable	1,548	(1,235)
Inventories	35	(94)
Prepaid expenses	434	612
Accounts payable	(773)	(1,439)
Accrued expenses	(1,392)	(2,729)
Net cash provided by operating activities	28,469	18,302
Cash flows from investing activities:
Proceeds from sale of assets		86
Change in construction payable	13,562	(104)
Acquisition of property and equipment	(54,819)	(20,449)
Net cash used in investing activities	(41,257)	(20,467)
Cash flows from financing activities:
Net exercise of stock options
Excess tax benefit from stock-based compensation
Long-term debt borrowings	10,770
Net cash provided by financing activities	10,770
Net decrease in cash	(2,018)	(2,165)
Cash and cash equivalents at beginning of period	29,151	26,383
Cash and cash equivalents at end of period	27,133	24,218
Supplemental disclosure of cash flow information
Cash paid for interest, net of amounts capitalized		209
Cash paid for income taxes	2,250	7,925
Return of assets under capital lease:
Accounts payable		(105)
Accrued expenses		$ (13)
ASC 606 Changes | ASU 2014-09
Adjustment to beginning retained earnings for accounting changes in accordance with the new revenue recognition standard
Accrued expenses	$ 4,858