Supplemental Information (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accrued liabilities
Accrued compensation	$ 153,828	$ 158,095
Deferred revenue	164,146	148,165
Other taxes payable	42,325	58,590
Workers' compensation liabilities	22,645	22,645
Interest payable	33,109	90,878
Warranty accrual	6,745	6,436
Litigation reserves	28,421	26,782
Current liability related to discontinue operation	60,291	68,961
Professional fees	3,146	2,989
Current deferred tax liability	12,172	10,721
Other accrued liabilities	6,390	5,118
Accrued liabilities	$ 533,218	$ 599,380