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Consolidated Condensed Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Net loss $ (640) $ (2,464)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Provision for losses on accounts receivable 103 139
Deferred gain on sales of equipment to affiliate 312  
Depreciation and amortization 12,326 14,342
Amortization of deferred financing fees 123 98
Deferred income tax expense (benefit) 78 (1,400)
Income tax benefit arising from restricted share vesting   (322)
Unrealized gain on ineffective portion of fuel hedge (175)  
Deferred gain on fuel hedge 436 (318)
Stock-based compensation expense 151 508
Equity in income of affiliate (245)  
Gain on disposition of property and equipment (2,962) (1,810)
Changes in operating assets and liabilities:    
Receivables and advances (1,704) (1,342)
Prepaid expenses and other assets 85 778
Inventory and supplies (29) (154)
Insurance and claims accrual 2,534 (3,160)
Accounts payable and accrued expenses 1,170 (4,170)
Net cash flows provided by operating activities 11,563 725
Cash flows from investing activities:    
Acquisition of property and equipment (6,934) (22,790)
Proceeds from disposition of property and equipment 21,304 11,337
Net cash flows provided by /(used in) investing activities 14,370 (11,453)
Cash flows from financing activities:    
Change in checks outstanding in excess of bank balances 1,029 1,349
Proceeds from issuance of notes payable 250 6,724
Income tax benefit arising from restricted share vesting   322
Repayments of notes payable (22,817) (19,872)
Repayments of capital lease obligations (477) (382)
(Repayments)/proceeds under revolving credit facility, net (3,973) 18,913
Payment of minimum tax withholdings on stock compensation   (452)
Debt refinancing costs (26)  
Net cash (used in)/provided by financing activities (26,014) 6,602
Net change in cash and cash equivalents (81) (4,126)
Cash and cash equivalents at beginning of period 3,895 9,361
Cash and cash equivalents at end of period $ 3,814 $ 5,235