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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
OPERATING ACTIVITIES:    
Net income $ 17,924,000 $ 7,338,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 36,526,000 31,333,000
Bad debt expense 677,000 186,000
Stock compensation-net of excess tax benefits 557,000 446,000
Provision for deferred income taxes 5,145,000 4,378,000
Reclassification of unrealized loss on marketable equity securities 42,000
Recognized loss (gain) on marketable equity securities 223,000 (4,669,000)
(Gain) loss on sale or disposition of equipment (607,000) 261,000
Changes in operating assets and liabilities:    
Accounts receivable (18,547,000) (7,191,000)
Prepaid expenses, deposits, inventories, and other assets 1,020,000 70,000
Income taxes refundable 148,000 99,000
Income taxes payable 83,000
Trade accounts payable 11,790,000 9,086,000
Accrued expenses and other liabilities 2,564,000 2,296,000
Net cash provided by operating activities 57,503,000 43,675,000
INVESTING ACTIVITIES:    
Purchases of property and equipment (51,365,000) (38,578,000)
Proceeds from disposition of equipment 13,043,000 16,485,000
Sales of marketable equity securities 6,007,000
Purchases of marketable equity securities, net of return of capital (2,269,000) (1,988,000)
Net cash used in investing activities (40,591,000) (18,074,000)
FINANCING ACTIVITIES:    
Borrowings under line of credit 447,523,000 341,106,000
Repayments under line of credit (429,402,000) (342,190,000)
Borrowings of long-term debt 35,146,000 17,598,000
Repayments of long-term debt (62,012,000) (35,554,000)
Borrowings under margin account 2,512,000 2,133,000
Repayments under margin account (863,000) (6,785,000)
Repurchases of common stock (10,251,000) (1,961,000)
Exercise of stock options 486,000 122,000
Net cash used in financing activities (16,861,000) (25,531,000)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 51,000 70,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH -Beginning of period 224,000 137,000
CASH, CASH EQUIVALENTS AND RESTRICTED CASH -End of period 275,000 207,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION-    
Interest 4,104,000 2,860,000
Income taxes 88,000 151,000
NONCASH INVESTING AND FINANCING ACTIVITIES-    
Purchases of property and equipment included in accounts payable $ 13,680,000 $ 7,819,000