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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
OPERATING ACTIVITIES:    
Net income $ 72,690 $ 48,625
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 46,647 41,426
Bad debt expense 732 837
Stock compensation-net of excess tax benefits 528 347
Provision for deferred income taxes 12,223 14,984
Recognized loss / (gain) on marketable equity securities 4,340 (5,382)
Gain on disposition of equipment (2,662) (962)
Changes in operating assets and liabilities:    
Accounts receivable (22,727) (27,584)
Prepaid expenses, deposits, inventories, and other assets (2,983) 1,781
Income taxes payable (4,346) 455
Trade accounts payable 4,917 1,929
Accrued expenses and other liabilities 10,714 (2,500)
Net cash provided by operating activities 120,073 73,956
INVESTING ACTIVITIES:    
Purchases of property and equipment (42,953) (15,297)
Acquisition of business, net of cash acquired (64,317) 0
Proceeds from disposition of equipment 12,568 28,047
Sales of marketable equity securities 0 1,496
Purchases of marketable equity securities, net of return of capital (918) (4,302)
Net cash (used in) provided by investing activities (95,620) 9,944
FINANCING ACTIVITIES:    
Borrowings under line of credit 720,879 450,222
Repayments under line of credit (720,879) (468,469)
Borrowings of long-term debt 59,849 6,594
Repayments of long-term debt (53,948) (42,032)
Borrowings under margin account 948 4,387
Repayments under margin account (1,127) (2,536)
Repurchases of common stock (5,877) (10,828)
Net cash used in financing activities (155) (62,662)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 24,298 21,238
CASH, CASH EQUIVALENTS AND RESTRICTED CASH -Beginning of period 18,509 337
CASH, CASH EQUIVALENTS AND RESTRICTED CASH -End of period 42,807 21,575
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:    
Interest 5,406 6,425
Income taxes 14,540 2,581
NONCASH INVESTING AND FINANCING ACTIVITIES:    
Purchases of property and equipment included in accounts payable $ 0 $ 2,282