Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities
Net loss	$ (15,056)	$ (36,670)	$ (11,930)
Non-cash items included in net loss
Gain on sale of property and equipment	(5,892)	(5,741)	(1,103)
Depreciation and amortization	14,555	22,078	20,151
Provision for losses on accounts receivable	(279)	1,081	918
Deferred income taxes	7	(2,322)	(5,474)
Deferred compensation	387	316	989
Equity in earnings of limited partnership	(868)	(914)	(816)
Change in operating assets and liabilities
Accounts receivable	3,660	(2,610)	(1,521)
Tires on equipment in use	(5,044)	(4,254)	(4,004)
Other current assets	333	(2,510)	6,607
Other assets	39	(1,495)	(451)
Accounts payable	(4,161)	3,303	4,612
Insurance and claims accruals	(1,513)	2,380	(3,423)
Accrued liabilities, payroll and other	92	146	(571)
Net cash (used in) provided by operating activities	(13,740)	(27,212)	3,984
Cash flows from investing activities
Expenditures for property and equipment	(13,482)	(22,118)	(20,858)
Proceeds from sale of property and equipment	13,357	22,540	7,094
Cash distributions from investment	365	1,596	1,016
Other	0	0	76
Net cash provided by (used in) investing activities	240	2,018	(12,672)
Cash flows from financing activities
Proceeds from borrowings under credit facility	93,210	118,501	51,026
Payments against borrowings under credit facility	(86,883)	(104,302)	(45,337)
Proceeds from notes payable and capital lease obligations	11,126	11,453	0
Repayments of notes payable and capital lease obligations	(2,032)	(616)	0
Income tax (expense) benefit of stock-based awards	(57)	33	(60)
Proceeds from capital stock transactions	0	22	671
Purchases of treasury stock	(5)	(52)	(76)
Net cash provided by financing activities	15,359	25,039	6,224
Net increase (decrease) in cash and cash equivalents	1,859	(155)	(2,464)
Cash and cash equivalents at beginning of year	1,048	1,203	3,667
Cash and cash equivalents at end of year	2,907	1,048	1,203
Supplemental disclosure of cash flow information:
Interest paid	792	552	58
Stock options	$ 0	$ 582	$ 0