Organization and Summary of Significant Accounting Policies Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 5,477	$ 5,900	$ 7,102
Bad debt expense	838	1,007	2,958
Write-offs, net of recoveries	(1,768)	(1,430)	(4,160)
Balance at end of year	4,547	5,477	5,900
Inventory Valuation Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	7,520	7,073	7,084
Provision for inventory write-downs	1,538	3,852	3,590
Deductions for inventory write-offs	(1,955)	(3,405)	(3,601)
Balance at end of year	$ 7,103	$ 7,520	$ 7,073