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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income $ 20,659 $ 14,185 $ 17,961
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 15,933 17,824 16,638
Amortization of deferred loan costs 338 305 305
Stock-based compensation 1,544 1,226 1,220
Excess tax benefit from stock-based compensation (865) (1,079) (413)
Provision (recoveries) for bad debts 240 51 (230)
(Gain) loss on disposition of assets (9) 343 176
Deferred income taxes (241) 336 795
Changes in operating assets and liabilities:      
Receivables (922) (470) 59
Inventories (35) (171) (293)
Prepaid expenses (289) (1,191) (194)
Accounts payable (1,186) (733) 604
Accrued expenses 2,546 1,150 342
Income taxes receivable 528 (531) (882)
Net cash provided by operating activities 38,241 31,245 36,088
Cash flows from investing activities:      
Proceeds from sale of assets 34 84 48
Change in construction payable (383) 1,790  
Acquisition of property and equipment (37,676) (21,719) (12,400)
Net cash used in investing activities (38,025) (19,845) (12,352)
Cash flows from financing activities:      
Net exercise of stock options 3,900 (2,726) 3,438
Excess tax benefit from stock-based compensation 865 1,079 413
Principal payments on long-term debt (5,400) (7,500) (27,300)
Net cash used in financing activities (635) (9,147) (23,449)
Net (decrease) increase in cash (419) 2,253 287
Cash and cash equivalents at beginning of period 21,583 19,330 19,043
Cash and cash equivalents at end of period 21,164 21,583 19,330
Supplemental disclosure of cash flow information:      
Cash paid for interest, net of amounts capitalized 374 853 1,472
Cash paid for income taxes 10,930 $ 7,300 $ 10,690
Conversion of short term deposit to long term deposit $ 908