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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
OPERATING ACTIVITIES:    
Net income (loss) $ 27,266 $ (2,127)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation 28,686 28,532
Bad debt expense 481 357
Stock compensation-net of excess tax benefits 253 326
Provision for deferred income taxes (benefit) 9,523 (900)
Recognized (gain) loss on marketable equity securities (5,838) 6,988
(Gain) Loss on sale or disposition of equipment (686) 103
Changes in operating assets and liabilities:    
Accounts receivable (12,695) 3,840
Prepaid expenses, deposits, inventories, and other assets 2,459 1,266
Income taxes payable 709 (132)
Trade accounts payable (1,216) 5,623
Accrued expenses and other liabilities 2,366 86
Net cash provided by operating activities 51,308 43,962
INVESTING ACTIVITIES:    
Purchases of property and equipment (4,453) (22,968)
Proceeds from disposition of equipment 25,197 7,066
Sales of marketable equity securities 1,424 861
Purchases of marketable equity securities, net of return of capital (660) (3,982)
Net cash provided by (used in) investing activities 21,508 (19,023)
FINANCING ACTIVITIES:    
Borrowings under line of credit 276,626 225,926
Repayments under line of credit (294,872) (230,497)
Borrowings of long-term debt 0 0
Repayments of long-term debt (30,334) (22,550)
Borrowings under margin account 713 4,004
Repayments under margin account (2,110) (1,492)
Repurchases of common stock (144) (321)
Net cash used in financing activities (50,121) (24,930)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 22,695 9
CASH, CASH EQUIVALENTS AND RESTRICTED CASH -Beginning of period 337 318
CASH, CASH EQUIVALENTS AND RESTRICTED CASH -End of period 23,032 327
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION-    
Interest 4,514 3,778
Income taxes 186 133
NONCASH INVESTING AND FINANCING ACTIVITIES-    
Purchases of property and equipment included in accounts payable $ 0 $ 7,672