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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
OPERATING ACTIVITIES:    
Net Income/(Loss) $ (2,629) $ 14,550
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 37,640 32,254
Bad debt expense 2,406 1,977
Stock compensation-net of excess tax benefits 393 242
Provision for deferred income taxes (831) 1,329
(Gain) Loss on marketable equity securities (1,434) 454
(Gain)/Loss on disposition of equipment 101 (836)
Changes in operating assets and liabilities:    
Accounts receivable (13,366) 31,222
Prepaid expenses, deposits, inventories, and other assets 5,589 4,303
Income taxes payable (590) 2,653
Trade accounts payable 1,176 (8,007)
Accrued expenses and other liabilities (185) (12,670)
Net cash provided by operating activities 28,270 67,471
INVESTING ACTIVITIES:    
Purchases of property and equipment (36,441) (12,985)
Proceeds from disposition of equipment 17,707 8,549
Sales of marketable equity securities 2,631 0
Net cash used in investing activities (16,103) (4,436)
FINANCING ACTIVITIES:    
Borrowings under lines of credit 384,836 498,082
Repayments under lines of credit (384,836) (498,082)
Borrowings of long-term debt 0 0
Repayments of long-term debt (35,538) (34,312)
Borrowings under margin account 0 30
Repayments under margin account 0 (757)
Repurchases of common stock (5,259) (4,095)
Net cash (used in) / provided by financing activities (40,797) (39,134)
NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH (28,630) 23,901
CASH, CASH EQUIVALENTS AND RESTRICTED CASH -Beginning of period 100,614 74,087
CASH, CASH EQUIVALENTS AND RESTRICTED CASH -End of period 71,984 97,988
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:    
Interest 6,193 4,546
Income taxes 669 1,655
NONCASH INVESTING AND FINANCING ACTIVITIES:    
Purchases of property and equipment included in accounts payable $ 1,353 $ 533