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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
OPERATING ACTIVITIES:    
Net income $ 48,124 $ 27,266
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 30,358 28,686
Bad debt expense 535 481
Stock compensation-net of excess tax benefits 353 253
Provision for deferred income taxes 9,564 9,523
Recognized loss / (gain) on marketable equity securities 1,952 (5,838)
Gain on sale or disposition of equipment (1,361) (686)
Changes in operating assets and liabilities:    
Accounts receivable (22,887) (12,695)
Prepaid expenses, deposits, inventories, and other assets (683) 2,459
Income taxes payable (4,125) 709
Trade accounts payable 2,659 (1,216)
Accrued expenses and other liabilities 10,378 2,366
Net cash provided by operating activities 74,868 51,308
INVESTING ACTIVITIES:    
Purchases of property and equipment (22,341) (4,453)
Acquisition of business, net of cash acquired (64,317) 0
Proceeds from disposition of equipment 5,382 25,197
Sales of marketable equity securities 0 1,424
Purchases of marketable equity securities, net of return of capital (113) (660)
Net cash (used in) provided by investing activities (81,389) 21,508
FINANCING ACTIVITIES:    
Borrowings under line of credit 495,871 276,626
Repayments under line of credit (495,871) (294,872)
Borrowings of long-term debt 47,222 0
Repayments of long-term debt (39,072) (30,334)
Borrowings under margin account 133 713
Repayments under margin account (707) (2,110)
Repurchases of common stock (3,000) (144)
Net cash provided by (used in) financing activities 4,576 (50,121)
NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH (1,945) 22,695
CASH, CASH EQUIVALENTS AND RESTRICTED CASH -Beginning of period 18,509 337
CASH, CASH EQUIVALENTS AND RESTRICTED CASH -End of period 16,564 23,032
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:    
Interest 3,581 4,514
Income taxes 9,857 186
NONCASH INVESTING AND FINANCING ACTIVITIES:    
Purchases of property and equipment included in accounts payable $ 0 $ 0