Organization and Summary of Significant Accounting Policies Allowance for Sales Returns and Doubtful Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts Receivable and Sales Returns [Roll Forward]
Balance at beginning of year	$ 2,878	$ 2,024	$ 2,433
Charged to revenue	776	2,190	2,039
Charged to (reversal of) expense	(180)	404	(100)
Utilization	(2,022)	(1,740)	(2,348)
Balance at end of year	$ 1,452	$ 2,878	$ 2,024