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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
OPERATING ACTIVITIES:    
Net income $ 7,338,000 $ 10,378,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 31,333,000 29,011,000
Bad debt expense 186,000 354,000
Sale leaseback deferred gain amortization (131,000)
Stock compensation-net of excess tax benefits 446,000 251,000
Provision for deferred income taxes 4,378,000 6,233,000
Reclassification of unrealized loss on marketable equity securities 42,000 709,000
Recognized gain on marketable equity securities (4,669,000) (1,003,000)
Loss (gain) on sale or disposition of equipment 261,000 (3,951,000)
Changes in operating assets and liabilities:    
Accounts receivable (1,683,000) (10,354,000)
Prepaid expenses, deposits, inventories, and other assets 70,000 100,000
Income taxes refundable 99,000 2,308,000
Trade accounts payable 9,086,000 10,195,000
Accrued expenses and other liabilities 2,296,000 (1,917,000)
Net cash provided by operating activities 49,183,000 42,183,000
INVESTING ACTIVITIES:    
Purchases of property and equipment (38,578,000) (55,948,000)
Proceeds from disposition of equipment 16,485,000 24,479,000
Change in restricted cash (5,508,000) (5,461,000)
Sales of marketable equity securities 6,007,000 1,550,000
Purchases of marketable equity securities, net of return of capital (1,988,000) (836,000)
Net cash used in investing activities (23,582,000) (36,216,000)
FINANCING ACTIVITIES:    
Borrowings under line of credit 341,106,000 375,930,000
Repayments under line of credit (342,190,000) (379,043,000)
Borrowings of long-term debt 17,598,000 52,224,000
Repayments of long-term debt (35,554,000) (33,092,000)
Borrowings under margin account 2,133,000 1,040,000
Repayments under margin account (6,785,000) (2,392,000)
Repurchases of common stock (1,961,000) (20,726,000)
Exercise of stock options 122,000 74,000
Net cash used in financing activities (25,531,000) (5,985,000)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 70,000 (18,000)
CASH AND CASH EQUIVALENTS-Beginning of period 137,000 157,000
CASH AND CASH EQUIVALENTS-End of period 207,000 139,000
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION-    
Interest 2,860,000 2,643,000
Income taxes 151,000 260,000
NONCASH INVESTING AND FINANCING ACTIVITIES-    
Purchases of property and equipment included in accounts payable $ 7,819,000 $ 2,788,000