Supplemental Balance Sheet, Income Statement and Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Accrued liabilities
Accrued compensation	$ 118,586	$ 177,707
Deferred revenue	318,890	298,345
Other taxes payable	19,443	58,445
Workers' compensation liabilities	37,459	37,459
Interest payable	17,806	63,532
Warranty accrual	5,805	5,799
Litigation reserves	24,657	23,681
Current liability to discontinued operations	8,354	19,602
Professional fees	2,521	2,550
Current deferred tax liability	3,677	3,677
Current liability to acquisition of KVS	22,278	22,278
Merger transaction accrual	77,696
Other accrued liabilities	12,640	14,929
Accrued liabilities	$ 669,812	$ 728,004