Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income (loss)	$ 22,788	$ (76,080)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization of property, equipment and intangibles	111,255	119,292
Amortization of debt issuance costs, original issue discount, and losses on terminated swaps	12,310	6,404
Gain on disposal of property and equipment less write-off of totaled tractors	(2,197)	(2,870)
Impairment of property and equipment		1,274
Deferred income taxes	15,785	(21,673)
Provision for (reduction of) allowance for losses on accounts receivable	21	(1,922)
Income effect of mark-to-market adjustment of interest rate swaps		16,813
Non-cash equity compensation	4,743
Increase (decrease) in cash resulting from changes in:
Accounts receivable	(55,454)	(34,539)
Inventories and supplies	(8,034)	836
Prepaid expenses and other current assets	(6,049)	1,470
Other assets	(6,315)	3,261
Accounts payable, accrued and other liabilities	33,360	20,986
Net cash provided by operating activities	122,213	33,252
Cash flows from investing activities:
Increase in restricted cash	(11,726)	(35,326)
Proceeds from sale of property and equipment	16,357	15,491
Capital expenditures	(111,158)	(58,705)
Payments received on notes receivable	3,784	2,702
Expenditures on assets held for sale	(4,987)	(981)
Payments received on assets held for sale	6,232	1,263
Payments received on equipment sale receivables		208
Net cash used in investing activities	(101,498)	(75,348)
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	(87,872)	(35,689)
Borrowings under accounts receivable securitization	86,000	79,000
Repayment of accounts receivable securitization	(81,500)	(90,000)
Payment of deferred loan costs	(3,425)
Other financing activities	250	228
Net cash used in financing activities	(23,553)	(46,461)
Net decrease in cash and cash equivalents	(2,838)	(88,557)
Cash and cash equivalents at beginning of period	47,494	115,862
Cash and cash equivalents at end of period	44,656	27,305
Cash paid during the period for:
Interest	50,956	147,958
Income taxes	4,280	25,358
Non-cash investing activities:
Equipment sales receivables	3,150	2,869
Equipment purchase accrual	5,946	21,711
Notes receivable from sale of assets	4,301	4,201
Non-cash financing activities:
Re-recognition of securitized accounts receivable		148,000
Capital lease additions	705	28,802
Cancellation of senior notes		89,352
Reduction in stockholder loan		231,000
Paid-in-kind interest on stockholder loan		$ 3,246