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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
OPERATING ACTIVITIES:    
Net income $ 20,648 $ 72,690
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 47,805 46,647
Bad debt expense 2,081 732
Stock compensation-net of excess tax benefits 387 528
Provision for deferred income taxes 5,970 12,223
Loss on marketable equity securities 422 4,340
Gain on disposition of equipment (1,175) (2,662)
Gain on sale of marketable equity securities (88) 0
Changes in operating assets and liabilities:    
Accounts receivable 34,827 (22,727)
Prepaid expenses, deposits, inventories, and other assets 4,119 (2,983)
Income taxes payable (2,772) (4,346)
Trade accounts payable (7,849) 4,917
Accrued expenses and other liabilities (10,571) 10,714
Net cash provided by operating activities 93,804 120,073
INVESTING ACTIVITIES:    
Purchases of property and equipment (26,784) (42,953)
Acquisition of business, net of cash acquired 0 (64,317)
Proceeds from disposition of equipment 15,727 12,568
Sales of marketable equity securities 143 0
Purchases of marketable equity securities, net of return of capital 0 (918)
Net cash used in investing activities (10,914) (95,620)
FINANCING ACTIVITIES:    
Borrowings under line of credit 692,253 720,879
Repayments under line of credit (692,253) (720,879)
Borrowings of long-term debt 0 59,849
Repayments of long-term debt (49,029) (53,948)
Borrowings under margin account 38 948
Repayments under margin account (951) (1,127)
Repurchases of common stock (4,736) (5,877)
Net cash used in financing activities (54,678) (155)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 28,212 24,298
CASH, CASH EQUIVALENTS AND RESTRICTED CASH -Beginning of period 74,087 18,509
CASH, CASH EQUIVALENTS AND RESTRICTED CASH -End of period 102,299 42,807
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:    
Interest 7,111 5,406
Income taxes 4,768 14,540
NONCASH INVESTING AND FINANCING ACTIVITIES:    
Purchases of property and equipment included in accounts payable $ 17,017 $ 0