Supplemental Information (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Accrued liabilities
Accrued compensation	$ 150,867	$ 158,095
Deferred revenue	183,383	148,165
Other taxes payable	66,304	58,590
Workers' compensation liabilities	22,645	22,645
Interest payable	90,285	90,878
Warranty accrual	6,458	6,436
Litigation reserves	33,592	26,782
Current liability to discontinued operations	57,737	68,961
Professional fees	3,147	2,989
Current deferred tax liability	12,005	10,721
Other accrued liabilities	8,412	5,118
Accrued liabilities	$ 634,835	$ 599,380