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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash flows from operating activities:    
Net income $ 10,270 $ 9,142
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 7,490 8,239
Amortization of deferred loan costs 153 152
Stock-based compensation 550 620
Excess tax benefit from stock-based compensation (285) (275)
Provision for bad debts 26 35
Loss (gain) on disposition of assets 663 (20)
Changes in operating assets and liabilities:    
Receivables (100) (83)
Inventories (17) 258
Prepaid expenses (367) (43)
Accounts payable 1,255 (1,499)
Accrued expenses (1,282) (830)
Income taxes (1,228) (798)
Net cash provided by operating activities 17,128 14,898
Cash flows from investing activities:    
Proceeds from sale of assets 20 23
Change in construction payable (1) 442
Acquisition of property and equipment (14,828) (15,202)
Net cash used in investing activities (14,809) (14,737)
Cash flows from financing activities:    
Net exercise of stock options 1,428 1,929
Excess tax benefit from stock-based compensation 285 275
Principal payments on long-term debt (5,900) (4,100)
Net cash used in financing activities (4,187) (1,896)
Net decrease in cash (1,868) (1,735)
Cash and cash equivalents at beginning of period 21,164 21,583
Cash and cash equivalents at end of period 19,296 19,848
Supplemental disclosure of cash flow information    
Cash paid for interest, net of amounts capitalized   247
Cash paid for income taxes $ 6,650 $ 5,500