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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Net (loss) income $ (14,267) $ 3,289 $ (25,030)
Provision for losses on accounts receivable 713 422 1,727
Deferred gain on sales of equipment to affiliate 562    
Depreciation and amortization 53,001 56,100 47,987
Goodwill impairment 11,539    
Amortization of deferred financing fees 414 715 851
Loss on sale of Transplace investment and note receivable     11,485
Gain on ineffective portion of fuel hedge     (31)
(Reversal into earnings) deferred gain on fuel hedge (773) 773  
Equity in income of affiliate (675)    
Deferred income tax (benefit) expense (2,158) 17,422 (8,664)
(Gain) loss on disposition of property and equipment (6,727) (4,293) 135
Income tax benefit arising from restricted share vesting and exercise of stock options (432) (421)  
Stock-based compensation expense 1,226 1,118 695
Receivables and advances (4,348) 1,018 9,948
Prepaid expenses and other assets 1,513 (2,097) 1,545
Inventory and supplies (130) (477) (110)
Insurance and claims accrual 1,056 1,690 (9,543)
Accounts payable and accrued expenses (8,453) (4,420) (97)
Net cash flows provided by operating activities 32,061 70,839 30,898
Acquisition of property and equipment (114,800) (137,347) (113,063)
Investment in affiliated company (1,500)    
Return of investment in affiliated company 241    
Proceeds from disposition of property and equipment 65,318 55,075 50,305
Payment of acquisition obligation     (250)
Net cash flows used in investing activities (50,741) (82,272) (63,008)
Cash flows from financing activities:      
Payment of minimum tax withholdings on stock compensation (561) (284) (115)
Proceeds from the exercise of stock options   1,308  
Proceeds (repayments) from/of borrowings under revolving credit facility, net 15,869 (12,665) 8,879
Repayments of capital lease obligation (1,651) (1,158) (298)
Change in checks outstanding in excess of bank balances 1,168 (43) 4,753
Proceeds from issuance of notes payable 85,152 97,766 95,592
Repayments of notes payable (86,938) (76,208) (70,219)
Debt refinancing costs (257) (564) (561)
Income tax benefit arising from restricted share vesting and exercise of stock options 432 421  
Net cash flows provided by financing activities 13,214 8,573 38,031
Net change in cash and cash equivalents (5,466) (2,860) 5,921
Cash and cash equivalents at beginning of year 9,361 12,221 6,300
Cash and cash equivalents at end of year 3,895 9,361 12,221
Interest, net of capitalized interest 16,236 16,710 13,016
Income taxes (295) (7,928) 239
Equipment purchased under capital leases 4,920 2,405 14,000
Non-cash change in variable rate real-estate note     157
Accrued property additions     811
Accrued investment in TEL $ 1,000