Certain Financial Statement Information Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2014 Machinery and Equipment [Member] Minimum	Jun. 30, 2014 Machinery and Equipment [Member] Maximum	Jun. 30, 2014 Leasehold Improvements [Member] Minimum	Jun. 30, 2014 Leasehold Improvements [Member] Maximum	Jun. 30, 2014 Computers, Office Furniture and Equipment [Member] Minimum	Jun. 30, 2014 Computers, Office Furniture and Equipment [Member] Maximum
Schedule of Property and equipment
Useful life			3 years	5 years	1 year	5 years	3 years	5 years
Machinery and equipment	$ 45,984	$ 44,503
Leasehold improvements	11,722	11,574
Computers, office furniture and equipment	43,500	43,365
Property and equipment, gross	101,206	99,442
Less: accumulated depreciation and amortization	(80,903)	(78,696)
Property and equipment, net	$ 20,303	$ 20,746