Organization and Summary of Significant Accounting Policies Property and Equipment and Software Development Costs (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 67,209,000	$ 53,528,000
Capitalized Computer Software, Additions	5,000,000	4,200,000
Capitalized Computer Software, Amortization	2,300,000	1,600,000	900,000
Computer Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Computer Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	6,992,000	3,692,000
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Property and equipment, gross	5,126,000	1,811,000
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	32,528,000	25,101,000
Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Internal Use Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 5,400,000	$ 7,400,000