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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net income $ 4,575 $ 4,043
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 3,700 4,131
Amortization of deferred loan costs 76 76
Stock-based compensation 127 291
Excess tax benefit from stock-based compensation (70)  
Provision for bad debts 18 7
Loss (gain) on disposition of assets 56 (18)
Changes in operating assets and liabilities:    
Receivables 231 152
Inventories 43 (8)
Prepaid expenses (294) (315)
Accounts payable 1,253 (1,674)
Accrued expenses (1,395) (655)
Income taxes 2,441 2,209
Net cash provided by operating activities 10,761 8,239
Cash flows from investing activities:    
Proceeds from sale of assets   20
Change in construction payable 466 411
Acquisition of property and equipment (8,928) (7,780)
Net cash used in investing activities (8,462) (7,349)
Cash flows from financing activities:    
Net exercise of stock options 376 297
Excess tax benefit from stock-based compensation 70  
Principal payments on long-term debt (5,500) (4,300)
Net cash used in financing activities (5,054) (4,003)
Net decrease in cash (2,755) (3,113)
Cash and cash equivalents at beginning of period 21,164 21,583
Cash and cash equivalents at end of period 18,409 18,470
Supplemental disclosure of cash flow information    
Cash paid for interest, net of amounts capitalized $ 9 $ 142