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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
OPERATING ACTIVITIES:    
Net income $ 21,536,000 $ 17,924,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 40,974,000 36,526,000
Bad debt expense 694,000 677,000
Stock compensation-net of excess tax benefits 736,000 557,000
Provision for deferred income taxes 6,081,000 5,145,000
Recognized (gain) loss on marketable equity securities (2,728,000) 223,000
Loss (gain) on sale or disposition of equipment 362,000 (607,000)
Changes in operating assets and liabilities:    
Accounts receivable 2,312,000 (18,547,000)
Prepaid expenses, deposits, inventories, and other assets 2,169,000 1,020,000
Income taxes refundable (299,000) 231,000
Trade accounts payable 3,218,000 11,790,000
Accrued expenses and other liabilities 1,340,000 2,564,000
Net cash provided by operating activities 76,395,000 57,503,000
INVESTING ACTIVITIES:    
Purchases of property and equipment (68,046,000) (51,365,000)
Proceeds from disposition of equipment 12,714,000 13,043,000
Sales of marketable equity securities 1,645,000
Purchases of marketable equity securities, net of return of capital (128,000) (2,269,000)
Net cash used in investing activities (53,815,000) (40,591,000)
FINANCING ACTIVITIES:    
Borrowings under line of credit 444,362,000 447,523,000
Repayments under line of credit (445,318,000) (429,402,000)
Borrowings of long-term debt 45,557,000 35,146,000
Repayments of long-term debt (51,253,000) (62,012,000)
Borrowings under margin account 387,000 2,512,000
Repayments under margin account (2,676,000) (863,000)
Repurchases of common stock (13,616,000) (10,251,000)
Exercise of stock options 0 486,000
Net cash used in financing activities (22,557,000) (16,861,000)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 23,000 51,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH -Beginning of period 282,000 224,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH -End of period 305,000 275,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION-    
Interest 6,258,000 4,104,000
Income taxes 601,000 88,000
NONCASH INVESTING AND FINANCING ACTIVITIES-    
Purchases of property and equipment included in accounts payable $ 5,711,000 $ 13,680,000