Supplemental Balance Sheet, Income Statement and Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accrued liabilities
Accrued compensation	$ 164,883	$ 173,732
Deferred revenue	146,051	172,578
Other taxes payable	56,574	44,652
Workers' compensation liabilities	22,645	22,645
Interest payable	33,751	99,869
Warranty accrual	5,964	5,237
Litigation reserves	30,672	23,687
Provision for termination payment		100,000
Current liability to discontinued operations	68,545	54,287
Professional fees	3,892	6,413
Income taxes payable	35,551	27,710
Current deferred tax liability		269
Other accrued liabilities	5,108	13,404
Accrued liabilities	$ 573,636	$ 744,483