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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
OPERATING ACTIVITIES:    
Net income $ 11,359 $ 4,619
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 27,329 29,536
Bad debt expense 506 496
Sale leaseback deferred gain amortization (149)  
Stock compensation-net of excess tax benefits 146 315
Provision for deferred income taxes 6,228 2,972
Reclassification of unrealized loss on marketable equity securities 1 29
Recognized gain on marketable equity securities (364) (24)
Gain on sale or disposal of equipment (3,414) (823)
Changes in operating assets and liabilities:    
Accounts receivable (3,515) (11,075)
Prepaid expenses, deposits, inventories, and other assets (315) 4,159
Income taxes refundable 230 (16)
Income taxes payable 27  
Trade accounts payable 1,256 1,810
Accrued expenses and other liabilities 4,149 4,016
Net cash provided by operating activities 43,474 36,014
INVESTING ACTIVITIES:    
Purchases of property and equipment (22,901) (55,694)
Proceeds from disposition of equipment 28,403 24,525
Change in restricted cash (2,275) (3,650)
Sales of marketable equity securities 439 13
Purchases of marketable equity securities, net of return of capital (931) 22
Net cash provided by (used in) investing activities 2,735 (34,784)
FINANCING ACTIVITIES:    
Borrowings under line of credit 365,015 315,222
Repayments under line of credit (362,140) (320,639)
Borrowings of long-term debt 19,299 30,802
Repayments of long-term debt (51,821) (25,881)
Borrowings under margin account 1,030 103
Repayments under margin account (1,117) (626)
Repurchases of common stock (16,006) (470)
Exercise of stock options 841 19
Net cash used in financing activities (44,899) (1,470)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 1,310 (240)
CASH AND CASH EQUIVALENTS-Beginning of period 1,172 507
CASH AND CASH EQUIVALENTS-End of period 2,482 267
Cash paid during the period for:    
Interest 2,256 2,578
Income taxes 927 62
NONCASH INVESTING AND FINANCING ACTIVITIES-    
Purchases of property and equipment included in accounts payable $ 387 $ 422