Organization and Summary of Significant Accounting Policies Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 5,900	$ 7,102	$ 11,426
Bad debt expense	1,007	2,958	779
Write-offs, net of recoveries	(1,430)	(4,160)	(5,103)
Balance at end of year	5,477	5,900	7,102
Inventory Valuation Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	7,073	7,084	7,805
Provision for inventory write-downs	3,852	3,590	875
Deductions for inventory write-offs	(3,405)	(3,601)	(1,596)
Balance at end of year	$ 7,520	$ 7,073	$ 7,084