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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net income (loss) $ 5,244 $ 6,065 $ (14,267)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Provision for losses on accounts receivable 457 904 713
Deferred gain on sales of equipment to affiliate 81 198 562
Depreciation and amortization 44,457 48,135 53,001
Goodwill impairment     11,539
Amortization of deferred financing fees 245 492 414
Reversal into earnings of deferred gain on fuel hedge     (773)
Unrealized gain on ineffective portion of fuel hedges (55)    
Income tax deficit (benefit) arising from restricted share vesting 111   (432)
Casualty premium credit   (4,000)  
Equity in income of affiliate (2,750) (1,875) (675)
Deferred income tax expense (benefit) 8,217 6,735 (2,158)
Gain on disposition of property and equipment (763) (4,913) (6,727)
Stock-based compensation expense 381 1,284 1,226
Changes in operating assets and liabilities:      
Receivables and advances (4,312) (10,415) (4,348)
Prepaid expenses and other assets (2,014) 4,630 1,513
Inventory and supplies (168) 61 (130)
Insurance and claims accrual (2,399) 3,979 1,056
Accounts payable and accrued expenses (6,287) 3,821 (8,453)
Net cash flows provided by operating activities 40,445 55,101 32,061
Cash flows from investing activities:      
Acquisition of property and equipment (135,896) (41,787) (114,800)
Investment in affiliated company (500) (2,900) (1,500)
Return of investment in affiliated company 65 316 241
Proceeds from disposition of property and equipment 51,930 57,525 65,318
Net cash flows (used in) provided by investing activities (84,401) 13,154 (50,741)
Cash flows from financing activities:      
Payment of minimum tax withholdings on stock compensation (340) (9) (561)
Proceeds (repayments) from/of borrowings under revolving credit facility, net 7,005 (15,885) 15,869
Repayments of capital lease obligation (2,186) (1,992) (1,651)
Change in checks outstanding in excess of bank balances (5,343) 2,298 1,168
Proceeds from issuance of notes payable 134,192 26,395 85,152
Repayments of notes payable (86,488) (76,085) (86,938)
Debt refinancing costs (356) (26) (257)
Income tax (deficit) benefit arising from restricted share vesting (111)   432
Net cash flows provided by (used in) financing activities 46,373 (65,304) 13,214
Net change in cash and cash equivalents 2,417 2,951 (5,466)
Cash and cash equivalents at beginning of year 6,846 3,895 9,361
Cash and cash equivalents at end of year 9,263 6,846 3,895
Supplemental disclosure of cash flow information:      
Interest, net of capitalized interest 10,328 12,967 16,236
Income taxes 320 342 (295)
Equipment purchased under capital leases 8,010   4,920
Accrued investment in TEL   $ 500 $ 1,000