Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 53,596	$ 82,084
Restricted cash	51,678	71,724
Restricted fixed maturity securities, held to maturity, amortized cost	22,275
Accounts receivable, net	338,724	324,035
Equipment sales receivable	563	5,500
Income tax refund receivable	10,046	3,396
Inventories and supplies	15,678	17,441
Assets held for sale	31,544	13,571
Prepaid taxes, licenses, insurance and other	47,241	46,559
Deferred income taxes	98,235	96,885
Current portion of notes receivable	4,957	6,455
Total current assets	674,537	667,650
Property and equipment, at cost:
Revenue and service equipment	1,740,456	1,674,452
Land	112,587	133,711
Facilities and improvements	234,996	229,420
Furniture and office equipment	43,578	41,183
Total property and equipment	2,131,617	2,078,766
Less: accumulated depreciation and amortization	819,803	778,769
Net property and equipment	1,311,814	1,299,997
Other assets	59,010	68,791
Intangible assets, net	333,561	350,486
Goodwill	253,256	253,256
Total assets	2,632,178	2,640,180
Current liabilities:
Accounts payable	103,070	81,688
Accrued liabilities	96,439	101,327
Current portion of claims accruals	74,070	73,266
Current portion of long-term debt and obligations under capital leases	47,495	59,339
Fair value of guarantees	366	1,195
Current portion of interest rate swaps	1,853
Total current liabilities	323,293	316,815
Long-term debt and obligations under capital leases, less current portion	1,323,539	1,530,104
Claims accruals, less current portion	98,919	96,277
Fair value of interest rate swaps, less current portion	11,159	10,061
Deferred income taxes	441,157	395,239
Securitization of accounts receivable	204,000	180,000
Other liabilities		4,131
Total liabilities	2,402,067	2,532,627
Commitments and contingencies (notes 14 and 15)
Stockholders' equity:
Preferred stock, par value $0.01 per share; Authorized 1,000,000 shares; none issued
Additional paid-in capital	896,575	891,899
Accumulated deficit	(660,168)	(774,757)
Accumulated other comprehensive loss	(7,894)	(11,186)
Noncontrolling interest	202	202
Total stockholders' equity	230,111	107,553
Total liabilities and stockholders' equity	2,632,178	2,640,180
Class A Common Stock [Member]
Stockholders' equity:
Common stock, value	871	859
Total stockholders' equity	871	859
Class B Common Stock [Member]
Stockholders' equity:
Common stock, value	525	536
Total stockholders' equity	$ 525	$ 536