Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Net (loss) income	$ (68)	$ 3,611
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Provision for losses on accounts receivable	141	296
Deferred gain on sales to equity method investee	285	24
Depreciation and amortization	21,576	24,387
Amortization of deferred financing fees	122	246
Deferred income tax expense	2,052	3,952
Income tax deficit arising from restricted share vesting	(111)
Unrealized loss on ineffective portion of fuel hedges	75	200
Casualty premium credit		(4,000)
Stock-based compensation expense, net	9	534
Equity in income of affiliate	(1,030)	(670)
Gain on disposition of property and equipment	(936)	(3,842)
Changes in operating assets and liabilities:
Receivables and advances	(10,546)	(7,328)
Prepaid expenses and other assets	(2,948)	(158)
Inventory and supplies	(120)	261
Insurance and claims accrual	7,936	4,521
Accounts payable and accrued expenses	(2,401)	4,234
Net cash flows provided by operating activities	14,036	26,268
Cash flows from investing activities:
Acquisition of property and equipment	(44,613)	(10,939)
Investment in affiliated company	(500)	(1,000)
Return of investment in affiliated company		139
Proceeds from disposition of property and equipment	26,875	37,685
Net cash flows (used in) /provided by investing activities	(18,238)	25,885
Cash flows from financing activities:
Change in checks outstanding in excess of bank balances	(479)	2,078
Proceeds from issuance of notes payable	42,556	250
Income tax deficit arising from restricted share vesting	111
Repayments of notes payable	(46,752)	(43,142)
Repayments of capital lease obligations	(1,028)	(962)
Proceeds/(repayments) under revolving credit facility, net	12,549	(9,859)
Payment of minimum tax withholdings on stock compensation	(200)
Debt refinancing costs	(347)	(27)
Net cash provided by/(used in) financing activities	6,410	(51,662)
Net change in cash and cash equivalents	2,208	491
Cash and cash equivalents at beginning of period	6,846	3,895
Cash and cash equivalents at end of period	$ 9,054	$ 4,386