Organization and Summary of Significant Accounting Policies Valuation and Qualifying Accounts Disclosure (Details) (Allowance for Doubtful Accounts [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 712	$ 286	$ 1,574
Increase (decrease) in allowance charged to expense	787	521	(1,170)
Accounts charged against the allowance, net of recoveries	(505)	(95)	(118)
Balance at end of year	$ 994	$ 712	$ 286