Organization and Summary of Significant Accounting Policies Income tax disclosure (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Tax Contingency [Line Items]
effective tax rate before discrete items	37.40%	39.60%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%
Income Tax Expense (Benefit)	$ 561	$ 1,380
Effective Income Tax Rate Reconciliation, Other Adjustments	18.00%
Research Tax Credit Carryforward [Member]
Income Tax Contingency [Line Items]
Income Tax Expense (Benefit)	$ 700