Supplemental Information (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accrued liabilities
Accrued compensation	$ 165,022	$ 158,095
Deferred revenue	183,049	148,165
Other taxes payable	63,504	58,590
Workers' compensation liabilities	22,645	22,645
Interest payable	19,012	90,878
Warranty accrual	6,172	6,436
Litigation reserves	28,597	26,782
Current liability to discontinued operations	64,278	68,961
Professional fees	3,228	2,989
Current deferred tax liability	12,105	10,721
Other accrued liabilities	11,864	5,118
Accrued liabilities	$ 579,476	$ 599,380