Supplemental Balance Sheet, Income Statement and Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Accrued liabilities
Accrued compensation	$ 153,783	$ 172,803
Deferred revenue	285,329	202,918
Other taxes payable	45,067	76,781
Workers' compensation liabilities	29,459	29,459
Interest payable	64,232	64,728
Warranty accrual	4,448	4,653
Litigation reserves	22,781	30,784
Current liability to discontinued operations	28,824	64,404
Professional fees	2,703	2,971
Current deferred tax liability	3,075	3,075
Current liability to acquisition of KVS	22,033	22,033
Other accrued liabilities	13,107	22,484
Accrued liabilities	$ 674,841	$ 697,093