Supplemental Balance Sheet, Income Statement and Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accrued liabilities
Accrued compensation	$ 158,676	$ 172,803
Deferred revenue	234,900	202,918
Other taxes payable	41,047	76,781
Workers' compensation liabilities	29,459	29,459
Interest payable	18,284	64,728
Warranty accrual	4,240	4,653
Litigation reserves	24,774	30,784
Current liability to discontinued operations	29,381	64,404
Professional fees	2,652	2,971
Current deferred tax liability	3,075	3,075
Current liability to acquisition of KVS	22,033	22,033
Other accrued liabilities	16,227	22,484
Accrued liabilities	$ 584,748	$ 697,093