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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:      
Net income $ 23,678 $ 31,816 $ 34,098
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 17,324 14,875 14,617
Amortization of deferred loan costs 764 538 538
Stock-based compensation 3,855 8,203 5,468
Provision for bad debts 159 189 93
Loss on disposition of assets 63   12
Write off of unamortized debt issuance costs 95    
Non cash operating lease expense (1) 14  
Deferred income taxes 15,774 1,344 (483)
Changes in operating assets and liabilities:      
Receivables 1,563 1,093 92
Income taxes (24,709) 94 1,729
Inventories (1,088) (3,043) (357)
Prepaid expenses (1,247) (730) (896)
Accounts payable (5,382) 5,855 2,998
Accrued expenses 596 2,998 847
Net cash provided by operating activities 31,444 63,246 58,756
Cash flows from investing activities:      
Proceeds from sale of assets 31 72  
Change in construction payable 42,243 (9,624) 11,329
Acquisition of property and equipment (88,667) (125,367) (137,074)
Net cash used in investing activities (46,393) (134,919) (125,745)
Cash flows from financing activities:      
Payroll taxes from net exercise of stock options (4,428)    
Proceeds from exercise of stock options 3,760    
Loan issuance cost (2,862)    
Principal payments on long-term debt (24,563) (3,750)  
Long-term debt borrowings 10,813 105,500 68,300
Net cash (used in) provided by financing activities (17,280) 101,750 68,300
Change in cash and cash equivalents (32,229) 30,077 1,311
Cash and cash equivalents at beginning of period 60,539 30,462 29,151
Cash and cash equivalents at end of period 28,310 60,539 30,462
Supplemental disclosure of cash flow information:      
Cash paid for interest, net of amounts capitalized 380   186
Cash paid for income taxes   $ 6,322 7,305
Conversion of long term deposit to short term deposit $ 908    
Accrued expenses - adjustment to beginning retained earnings for accounting changes in accordance with the new revenue recognition standard     $ 4,858