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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Net loss $ (1,374) $ (1,959)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Provision for losses on accounts receivable 93 13
Deferred gain on sales to equity method investee 34 84
Depreciation and amortization 12,608 11,621
Amortization of deferred financing fees 61 61
Deferred income tax benefit (345) (362)
Income tax deficit arising from restricted share vesting   112
Unrealized loss on ineffective portion of fuel hedges 85  
Stock-based compensation expense 3 188
Equity in income of affiliate (800) (480)
Loss (gain) on disposition of property and equipment 482 (705)
Changes in operating assets and liabilities:    
Receivables and advances (112) (1,150)
Prepaid expenses and other assets 1,410 1,802
Inventory and supplies (36) 36
Insurance and claims accrual (294) (285)
Accounts payable and accrued expenses (611) (1,697)
Net cash flows provided by operating activities 11,204 7,279
Cash flows from investing activities:    
Acquisition of property and equipment (17,744) (15,432)
Investment in affiliated company   (500)
Proceeds from disposition of property and equipment 19,920 11,690
Net cash flows provided by (used in) investing activities 2,176 (4,242)
Cash flows from financing activities:    
Change in checks outstanding in excess of bank balances 735 (842)
Proceeds from issuance of notes payable 9,766 15,900
Income tax deficit arising from restricted share vesting   (112)
Repayments of notes payable (24,685) (19,215)
Repayments of capital lease obligations (732) (510)
Proceeds under revolving credit facility, net 12,291 3,995
Payment of minimum tax withholdings on stock compensation (67) (200)
Debt refinancing costs (33) (350)
Net cash used in financing activities (2,725) (1,334)
Net change in cash and cash equivalents 10,655 1,703
Cash and cash equivalents at beginning of period 9,263 6,846
Cash and cash equivalents at end of period $ 19,918 $ 8,549