Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income (loss)	$ 53,738	$ (77,099)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization of property, equipment and intangibles	166,822	172,081
Amortization of debt issuance costs, original issue discount, and losses on terminated swaps	17,665	10,114
Gain on disposal of property and equipment less write-off of totaled tractors	(4,139)	(4,322)
Impairment of property and equipment		1,274
Deferred income taxes	32,752	(20,657)
Reduction of allowance for losses on accounts receivable	(530)	(1,489)
Income effect of mark-to-market adjustment of interest rate swaps		23,427
Non-cash equity compensation	5,524
Loss on debt extinguishment	217
Increase (decrease) in cash resulting from changes in:
Accounts receivable	(57,095)	(54,988)
Inventories and supplies	(7,670)	246
Prepaid expenses and other current assets	(4,742)	(3,608)
Other assets	(12,310)	12,175
Accounts payable, accrued and other liabilities	26,989	56,931
Net cash provided by operating activities	217,221	114,085
Cash flows from investing activities:
Decrease (increase) in restricted cash	9,994	(47,616)
Proceeds from sale of property and equipment	46,869	30,536
Capital expenditures	(168,046)	(108,175)
Payments received on notes receivable	5,118	4,179
Expenditures on assets held for sale	(6,093)	(1,929)
Payments received on assets held for sale	9,089	2,365
Payments received on equipment sale receivables		208
Net cash used in investing activities	(103,069)	(120,432)
Cash flows from financing activities:
Proceeds from issuance of Class A common stock, net of issuance costs	62,994
Repayment of long-term debt and capital leases	(189,390)	(42,599)
Borrowings under accounts receivable securitization	164,000	117,000
Repayment of accounts receivable securitization	(155,500)	(125,000)
Payment of deferred loan costs	(3,711)
Tax distributions on behalf of stockholders		(1,322)
Other financing activities	138	342
Net cash used in financing activities	(121,469)	(51,579)
Net decrease in cash and cash equivalents	(7,317)	(57,926)
Cash and cash equivalents at beginning of period	47,494	115,862
Cash and cash equivalents at end of period	40,177	57,936
Cash paid during the period for:
Interest	73,181	205,607
Income taxes	7,537	27,019
Non-cash investing activities:
Equipment sales receivables	6,058	1,201
Equipment purchase accrual	7,952	31,199
Notes receivable from sale of assets	3,264	7,499
Non-cash financing activities:
Re-recognition of securitized accounts receivable		148,000
Capital lease additions	705	54,134
Cancellation of senior notes		89,352
Reduction in stockholder loan		231,000
Paid-in-kind interest on stockholder loan		$ 4,848