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

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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