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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
OPERATING ACTIVITIES:    
Net (loss) / income $ (2,127) $ 16,955
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation 28,532 26,801
Bad debt expense 357 216
Stock compensation-net of excess tax benefits 326 526
Provision for deferred income (benefit) /taxes (900) 4,923
Recognized loss / (gain) on marketable equity securities 6,988 (2,593)
Loss (gain) on sale or disposition of equipment 103 (327)
Changes in operating assets and liabilities:    
Accounts receivable 3,840 1,119
Prepaid expenses, deposits, inventories, and other assets 1,266 2,690
Income taxes payable (132) (98)
Trade accounts payable 5,623 1,385
Accrued expenses and other liabilities 86 1,602
Net cash provided by operating activities 43,962 53,199
INVESTING ACTIVITIES:    
Purchases of property and equipment (22,968) (26,912)
Proceeds from disposition of equipment 7,066 7,760
Sales of marketable equity securities 861 762
Purchases of marketable equity securities, net of return of capital (3,982) (72)
Net cash used in investing activities (19,023) (18,462)
FINANCING ACTIVITIES:    
Borrowings under line of credit 225,926 283,704
Repayments under line of credit (230,497) (283,187)
Borrowings of long-term debt 0 16,386
Repayments of long-term debt (22,550) (37,006)
Borrowings under margin account 4,004 252
Repayments under margin account (1,492) (1,431)
Repurchases of common stock (321) (13,441)
Net cash used in financing activities (24,930) (34,723)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 9 14
CASH, CASH EQUIVALENTS AND RESTRICTED CASH -Beginning of period 318 282
CASH, CASH EQUIVALENTS AND RESTRICTED CASH -End of period 327 296
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION-    
Interest 3,778 4,102
Income taxes 133 292
NONCASH INVESTING AND FINANCING ACTIVITIES-    
Purchases of property and equipment included in accounts payable $ 7,672 $ 566