Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Net income (loss)	$ 2,406	$ (68)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Provision for losses on accounts receivable	426	141
(Reversal) deferred gain on sales to equity method investee	(72)	285
Depreciation and amortization	24,970	21,576
Amortization of deferred financing fees	123	122
Deferred income tax benefit	3,028	2,052
Income tax (benefit) deficit arising from restricted share vesting	(145)	111
Unrealized (gain) loss on ineffective portion of fuel hedges	(20)	75
Stock-based compensation expense	253	9
Equity in income of affiliate	(1,650)	(1,030)
Gain on disposition of property and equipment	(579)	(936)
Changes in operating assets and liabilities:
Receivables and advances	(3,122)	(10,546)
Prepaid expenses and other assets	(933)	(2,948)
Inventory and supplies	10	(120)
Insurance and claims accrual	234	7,936
Accounts payable and accrued expenses	191	(2,401)
Net cash flows provided by operating activities	25,120	14,258
Cash flows from investing activities:
Acquisition of property and equipment	(59,417)	(44,613)
Return on investment (investment) in affiliated company	307	(500)
Proceeds from disposition of property and equipment	48,540	26,875
Net cash flows used in investing activities	(10,570)	(18,238)
Cash flows from financing activities:
Change in checks outstanding in excess of bank balances	(422)	(479)
Proceeds from issuance of notes payable	36,063	42,556
Income tax benefit (deficit) arising from restricted share vesting	145	(111)
Repayments of notes payable	(48,385)	(46,752)
Repayments of capital lease obligations	(1,468)	(1,028)
Proceeds under revolving credit facility, net	9,813	12,549
Payment of minimum tax withholdings on stock compensation	(174)	(200)
Debt refinancing costs	(34)	(347)
Net cash used in financing activities	(4,462)	6,188
Net change in cash and cash equivalents	10,088	2,208
Cash and cash equivalents at beginning of period	9,263	6,846
Cash and cash equivalents at end of period	$ 19,351	$ 9,054