CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 26,839	$ 21,141
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,081	11,397
Amortization of deferred loan costs	403	403
Stock-based compensation	4,197	5,199
Provision for bad debts	27	152
Loss on disposition of assets	12	4
Changes in operating assets and liabilities:
Receivables	(35)	(1,933)
Income taxes	2,099	(451)
Inventories	11	(13)
Prepaid expenses	1	(112)
Accounts payable	691	(373)
Accrued expenses	(335)	(669)
Net cash provided by operating activities	44,991	34,745
Cash flows from investing activities:
Proceeds from sale of assets		86
Change in construction payable	19,178	2,144
Acquisition of property and equipment	(101,696)	(36,537)
Net cash used in investing activities	(82,518)	(34,307)
Cash flows from financing activities:
Long-term debt borrowings	43,070
Net cash provided by financing activities	43,070
Change in cash	5,543	438
Cash and cash equivalents at beginning of period	29,151	26,383
Cash and cash equivalents at end of period	34,694	26,821
Supplemental disclosure of cash flow information
Cash paid for interest, net of amounts capitalized	186	235
Cash paid for income taxes	4,650	11,200
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