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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
OPERATING ACTIVITIES:    
Net income $ 2,935 $ 5,369
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 9,177 7,557
Bad debt expense 135 82
Sale leaseback deferred gain amortization (57) (56)
Stock compensation-net of excess tax benefits 149 119
Deferred 1,783 $ 2,988
Reclassification of unrealized loss on marketable equity securities 235
Recognized loss on marketable equity securities 89 $ 13
Gain on sale or disposal of equipment (1,390) (1,161)
Changes in operating assets and liabilities:    
Accounts receivable (5,625) (2,422)
Prepaid expenses, inventories, and other assets (255) 1,724
Income taxes refundable 2,386 377
Trade accounts payable 4,385 5,410
Accrued expenses and other liabilities 1,459 1,810
Net cash provided by operating activities 15,406 21,810
INVESTING ACTIVITIES:    
Purchases of property and equipment (20,828) (14,581)
Proceeds from disposition of equipment 3,970 4,412
Change in restricted cash (1,239) $ (1,566)
Sales of marketable equity securities 279
Purchases of marketable equity securities, net of return of capital (886) $ (2,395)
Net cash used in investing activities (18,704) (14,130)
FINANCING ACTIVITIES:    
Borrowings under line of credit 117,758 133,644
Repayments under line of credit (126,485) (133,644)
Borrowings of long-term debt 22,054 10,473
Repayments of long-term debt (10,377) (16,338)
Borrowings under margin account 953 2,476
Repayments under margin account (555) (272)
Repurchases of common stock (122) (28,743)
Exercise of stock options 74 57
Net cash provided by (used in) financing activities 3,300 (32,347)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 2 (24,667)
CASH AND CASH EQUIVALENTS-Beginning of period 157 27,649
CASH AND CASH EQUIVALENTS-End of period 159 2,982
Cash paid during the period for:    
Interest 824 619
Income taxes 38 40
NONCASH INVESTING AND FINANCING ACTIVITIES-    
Purchases of property and equipment included in accounts payable $ 10,345 $ 941