Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 35,515	$ 82,084
Restricted cash	57,168	71,724
Fixed maturity securities, held to maturity, amortized cost-restricted	14,612
Accounts receivable, net	348,889	324,035
Equipment sales receivable	1,755	5,500
Income tax refund receivable	2,317	1,881
Inventories and supplies	17,812	17,441
Assets held for sale	13,307	13,571
Prepaid taxes, licenses, insurance and other	44,350	46,559
Deferred income taxes	64,447	96,885
Current portion of notes receivable	5,051	6,455
Total current assets	605,223	666,135
Property and equipment, at cost:
Revenue and service equipment	1,703,760	1,674,452
Land	125,788	133,711
Facilities and improvements	231,044	229,420
Furniture and office equipment	43,415	41,183
Total property and equipment	2,104,007	2,078,766
Less: accumulated depreciation and amortization	802,347	778,769
Net property and equipment	1,301,660	1,299,997
Other assets	70,765	68,791
Intangible assets, net	341,968	350,486
Goodwill	253,256	253,256
Total assets	2,572,872	2,638,665
Current liabilities:
Accounts payable	98,796	81,688
Accrued liabilities	100,083	101,327
Current portion of claims accruals	71,828	73,266
Current portion of long-term debt and obligations under capital leases	46,854	59,339
Fair value of guarantees	1,195	1,195
Current portion of interest rate swaps	373
Total current liabilities	319,129	316,815
Long-term debt and obligations under capital leases, less current portion	1,408,123	1,530,104
Claims accruals, less current portion	104,596	96,277
Fair value of interest rate swaps, less current portion	11,797	10,061
Deferred income taxes	393,934	415,088
Securitization of accounts receivable	203,000	180,000
Other liabilities		4,131
Total liabilities	2,440,579	2,552,476
Contingencies (note 15)
Stockholders' equity:
Preferred stock, par value $0.01 per share; Authorized 1,000,000 shares; none issued
Additional paid-in capital	894,754	891,899
Accumulated deficit	(756,234)	(796,121)
Accumulated other comprehensive loss	(7,824)	(11,186)
Noncontrolling interests	202	202
Total stockholders' equity	132,293	86,189
Total liabilities and stockholders' equity	2,572,872	2,638,665
Common Class A [Member]
Stockholders' equity:
Common stock value	870	859
Total stockholders' equity	870	859
Common Class B [Member]
Stockholders' equity:
Common stock value	525	536
Total stockholders' equity	$ 525	$ 536