Supplemental Balance Sheet, Income Statement and Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accrued liabilities
Accrued compensation	$ 172,803	$ 158,095
Deferred revenue	202,918	148,165
Other taxes payable	76,781	58,590
Workers' compensation liabilities	29,459	22,645
Interest payable	64,728	90,878
Warranty accrual	4,653	6,436
Litigation reserves	30,784	26,782
Current liability to discontinued operations	64,404	68,961
Professional fees	2,971	2,989
Current deferred tax liability	3,075	10,721
Current liability to acquisition of KVS	22,033
Other accrued liabilities	22,484	5,118
Accrued liabilities	$ 697,093	$ 599,380